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Prime Currently running temps @71C - need quick reply!

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November 18, 2008 9:44:41 AM

Hi,

I'm trying to test if my OC is stable on my Q6600 which is at 3.6ghz. I've just managed an hour (and its still running now!) without any errors.

My Question is should i abort becasue my core temps are sat around 70C? I don't want to cause any damage to my cpu. My Ind' core temps in prime are:

Core 0: norm' 70-71, max 73
Core 1: norm' 70-71, max 72
Core 2: norm'66-67, max 68
Core 3: norm' 65-66, max 67

i've read that my threshold on a q6600 is 71C and that any prolonged use can damage the chip.

How long should i carry on testing in prime for at these temps?

I do have all fans on max and CPU internal Thermal Control enabled.

I would be really appreciate a quick response.

Thanks,

Rob.

November 18, 2008 10:42:58 AM

Core 2 failed at 1hr 26mins.

November 18, 2008 11:01:55 AM

Hmm... Definitely too high.

Try to lower the temps first. Whats your current cooler?
November 18, 2008 11:09:48 AM

I have an Asus Silent Knight II.

After Prime failed HWmonitor would read any temps or volts and system wouldn't shut down, i had to use reset button.

Reboot failed so i allowed to cool down before trying again. I am back in and everything seems fine.

Do you think it faile due to temp or lack of voltage? if the latter then i guess 3.6 may be too much with current cooler.
a b à CPUs
November 18, 2008 11:18:11 AM

Once you reach those temperatures, you have to back down voltage or speed.
Improving cooling may allow you to go further.
November 18, 2008 11:34:55 AM

Ok, i'll have a go at dropping my voltages.

Do you think i would have done any damage to my CPU running 1 1/2 hrs at 70C?
a b à CPUs
November 18, 2008 11:36:29 AM

No damage.
November 18, 2008 11:59:26 AM

I would suggest you to find a stable speed with coretemp always below 71º. If not possible with 3.6 GHz you should lower your speed.
I'm not sure you can get 3.6 on a Q6600 with that cooler, I'm already impressed you managed to run prime for more than an hour at that speed. Are you using stress test (the one that says no memory tested) or the blend (some or lots of memory tested)?
November 18, 2008 12:34:50 PM

I ran Prime using large ffts it says it produces max heat, little ram tested.

Do you not rate my cooler? I was recommended to get this one. I thought it was good because it is one of the few that are 100% copper. i'll see if i can lower my voltages further and then re-test until i can keep all cores below 70C


November 18, 2008 12:52:18 PM

It seems to be a good cooler, but getting 3.6 on a Q6600 is for the ones that use 120mm fans (and only a few of them).
November 18, 2008 1:15:29 PM

rob_cunningham said:
Hi,

I'm trying to test if my OC is stable on my Q6600 which is at 3.6ghz. I've just managed an hour (and its still running now!) without any errors.

My Question is should i abort becasue my core temps are sat around 70C? I don't want to cause any damage to my cpu. My Ind' core temps in prime are:

Core 0: norm' 70-71, max 73
Core 1: norm' 70-71, max 72
Core 2: norm'66-67, max 68
Core 3: norm' 65-66, max 67

i've read that my threshold on a q6600 is 71C and that any prolonged use can damage the chip.

How long should i carry on testing in prime for at these temps?

I do have all fans on max and CPU internal Thermal Control enabled.

I would be really appreciate a quick response.

Thanks,

Rob.



what is your vid and your current voltage?
November 18, 2008 1:19:18 PM

VID= 1.250v

These are my voltage settings:

CPU = 1.4375v
PLL = auto
VTT = 1.46v
Mem = 2.1v
NB = 1.52v
SB = 1.55v
1.2 HT = 1.25v
GTL_REF = +50mv
Loadline is enabled.

I'm running 400fsb x9.

Any suggestions would be great thanks.

Anonymous
a b à CPUs
a b K Overclocking
November 18, 2008 1:39:35 PM

Seems like its too high for you... I for one have seen max temps... under 12 hour prime stable on my own q9550 at OVER 80 Celcius... way to high for me... left it on over night and i came back in the morning and saw it I was like sh*t!!!!.... apparently no dicernable harm came from it though so I backed down on everything and now i'm at 3.85 ghz at 1.25 volt core with max load 71 C in the summer so now i'm happy

BTW for stability always run small fft first and then run the Blend test and then the Large FFT... thats the order I do my tests in.... if you can get small fft stable but can't pass blend that means A. Your ram is going to fast, or B. you need to raise northbridge voltage and then for large its just a test to make sure under max temperature it still runs ok
November 18, 2008 1:50:45 PM

just dropped cpu voltage down one click (1.43125v) and raised PLL up one (1.5v) and its looking ok.

You are probably right its too high for a stable OC but i am a persistent "bar-steward".

I am going to see how low i can get my cpu voltage before i give up.
Anonymous
a b à CPUs
a b K Overclocking
November 18, 2008 2:01:58 PM

1.4 volts for 3.6? thats seems high to me... I'd think 1.38 or something would be ok for a q6600 @ 3.6
November 18, 2008 5:38:09 PM

As I said before, I don't think that cooler can handle 3.6 GHz, although for a 92mm one, its very good.
Remember that just a few apps are able to stress your cpu nearly as much as Prime, so if you're not using any of them, you may keep 3.6 GHz, but for your safety I would lower the speed to 3.4GHz or buy a very good 120 mm fan CPU Cooler. There are some no to expensive that use direct touch technology that should be able to let you stay at 3.6 with temps below 67
a b à CPUs
a b K Overclocking
November 18, 2008 6:10:58 PM

Guys,

Please read: Core 2 Quad and Duo Temperature Guide - http://www.tomshardware.com/forum/221745-29-core-quad-t...


Section 6: Scale

Scale 2: Quad

Scale 2: Quad
Q9x50: Tcase Max 71c, Stepping E0, TDP 95W, Idle 16W
Q9x50: Tcase Max 71c, Stepping C1, TDP 95W, Idle 16W
Q9400: Tcase Max 71c, Stepping R0, TDP 95W, Idle 16W
Q9300: Tcase Max 71c, Stepping M1, TDP 95W, Idle 16W
Q8200: Tcase Max 71c, Stepping M1, TDP 95W, Idle 16W
Q8200: Tcase Max 71c, Stepping R0, TDP 95W, Idle 16W
Q6x00: Tcase Max 71c, Stepping G0, TDP 95W, Idle 16W (Q6600 G0)

-Tcase/Tjunction-
--70--/--75--75--75--75-- Hot
--65--/--70--70--70--70-- Warm
--60--/--65--65--65--65-- Safe
--25--/--30--30--30--30-- Cool


Tcase = CPU temperature
Tjunction = Core temperature

The Guide shows how to calibrate your temperatures, and will bring you up to speed on how it all works. Also, Intel's Thermal Specification, shown in their Processor Spec Finder - http://processorfinder.intel.com/details.aspx?sSpec=SLA... - is for CPU temperature, not Core temperature, which is a common misconception among many users.

As you may not be aware, Prime95 Small FFT's is the standard for CPU thermal testing, as well as CPU stability testing. Small FFT's provides a steady-state 100% workload for the processor Cores, while Large FFT's and Blend do not. The description for Large FFT's is misleading, since it in fact does not produce 100% CPU workload and heat, although power consumed in Watts at the power cord will be slightly higher due to higher memory workload. The CPU temperature and Core temperatures will be ~ 4c higher using Small FFT's. Try it and see for yourself.

In order to compare apples to apples, thermal testing should be done as close to 22c ambient as possible. If ambient is higher or lower, then simply add or subtract the difference from your test results, so that your temperatures are adjusted to reference 22c, which is specified as the "standard" for ambient. Case covers should be removed, and all fans should be at 100% RPM. Since thermal saturation is typically reached within 7 to 8 minutes, a 10 minute test run with Small FFT's is sufficient. For stability testing, 8 hours of Small FFT's is the minimum, and 24 hours is considered proof of stability.

Currently the 2 best air coolers available are:

(1) Sunbeamtech Core Contact Freezer - http://www.newegg.com/Product/Product.aspx?Item=N82E168...
(2) Xigmatek HDT-S1283 - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Google the reviews and see for yourself - http://www.frostytech.com/articleview.cfm?articleid=227...


Hope this helps to clarify these issues,

Comp :sol: 
November 18, 2008 10:07:57 PM

Hey Thanks for the info. There is a lot of interesting views. Its a little reassuring the post from Compu that i didn't exceed too high temps on my testing - although it still wasn't great.

Also Thogrom, do you really think 1.38v is realistic to be stable at 3.6ghz? if so then there is hope for me yet. And do you mean 1.38v set in the bios or as CPU-Z reads? you can see that the vdrop on my board is quite high - running at 1.4375v in bios gave 1.376 in CPU-Z.

I think you are probably right that i would need to upgrade my cooler if i want to get 3.6 at a sensible temp but in the meantime i am only going to lower my voltages and see what i get. I'll keep an eye on any Prime tests just incase temps get too high again.

Thanks again from all you.

I'll post any news of sucess or probably failures.

November 18, 2008 11:08:32 PM

For a 1.25 vid you shouldn't need 1.40+ for 3.6, I know each chip can vary, but I would imagine you should be able to get 3.6 with 1.35ish. Lupiron can help you with Q6600's but I'm betting he tells you to get a better cooler
November 19, 2008 6:31:01 AM

Tried contacting Lupiron a couple of times becasue he has the same board as me and had the same chip. unfortunately i haven't heard from him. I've read all his posts on the P5N72-T mobo but he only hinted at a few of his settings.

If there's a possibilty of acheiving a stable 3.6 below 1.4v then this itself could solve my cooling issue.

I'm a little reluctant to change my cooler as i have only had it a couple of months.

I'm still very much a "noob" to overclocking and i do take on board all of your comments and advice.

Thanks again.
November 19, 2008 8:37:07 AM

Hey,

I running again at 3.6ghz with now only 1.35v on the CPU.

My settings are:

CPU = 1.350v
PLL = 1.58v
VTT = 1.38v
Mem = 2.1v
NB = 1.52v
SB = 1.60v
1.2 HT = 1.40v
GTL_REF = +50mv
Loadline is enabled

Before i disappoint myself by running Prime and watching it fail (again) i thought i would just try and see how the system runs first. Like Rojito said I am not going to be using any programmes that can stress my pu as much as Prime will.

Before reaching these settings I did run Prime using small ffts. my voltages were as above expcept PLL was on auto and 1.2HT was on 1.30 & 1.35v and both BSOD in about 10sec. Is that an indication of voltages being too low somewhere? If so, does anyone know which is the likely culprit?

BTW my Vcore in CPU-Z is now only 1.280v when set at 1.35 in the bios. Loadline seems to cure any/most vdroop (is that one correct?) when system is stressed.
a b à CPUs
a b K Overclocking
November 19, 2008 11:58:46 AM

Quote:
Tried contacting Lupiron

Lupi hasn't been here for ~ 3 weeks.
November 19, 2008 12:27:44 PM

1) I would say, forget (for now) about the difference between mobo and CPUZ voltages, and use your mobo's for reference. The good thing is you can load windows with that setting, thus making possible the testing.
My advice would be to use all the settings you had when you had an almost stable and overheated CPU but keep the 1.350v. Load Prime and test, if it fails take it up a bit and retest, and so on until you get a stable setting. Then try lowering other voltages like your NB's.
2) About the difference between Mobo's and CPUZ's voltage reading, probably CPUZ is telling the truth, but that's just a guess.
3) I repeat, it`s almost impossible to get 3.6 (at decent temperatures) out of a q6600 with even the best 92mm cpu fan and keep in mind that with time dust reduces the cooling capability of your system and temps could reach some degrees higher, so make sure you can't stay at about 3.4 instead of 3.6. The difference on performance will be much much less than the idea of using a number like 389 (fsb) instead of a round and pretty 400
November 19, 2008 2:18:04 PM

Thanks. i'll certainly give it a go. I'm useless at the math for working out clock speeds from the Fsb and multiplier. Am i assuming you are suggesting an fsb of 400 and reduce the multi to 8.5? becasue i don't have the option to use 1/2 multipliers.

otherwise i guess i would be dropping the fsb.
November 19, 2008 6:12:35 PM

Hi,

I think 3.6 may be out of my reach for the time being. I tried what RoJito suggest and used same voltages as my best Prime run but with CPU voltage of 1.35 and then creep up until stable. This was working up until about 1.3625v, it was gradually getting better results in Prime but then anything higher wouldn't even boot. I kept creeping up until 1.38125v and still wouldn't boot. I figure much higher than this and i'm back into the high temps again.

I've just had a go at 3.4GHz using 425 x8. Prime is currently running and "looks" like it going well. Max core temps are between 57-63C.

Is there a performance difference between the same clock speed but using lower multipliers with higher fsb?

November 19, 2008 6:27:23 PM

I'm suggesting you to drop your fsb a litle bit in order to get around 3.4 GHz if you cant find a stable 3.6 with acceptable temps.
I don't know how your MOBO works in BIOS, but you seem to know you are at 400fsb, which means 400 x 9 (multi) = 3600MHz / 1000 = 3.6 GHz.
If you lower that 400 to say 380, you get 3.42 GHz.
You can also use the 8x multi as you wrote, but I don't like that option (in my case) cause if I ask for a Multi other than 9x it will stay there even when Idle. If I use 9x and the computer is Idle it drops to 6x, which means basically less power consumption. That is with my MOBO, maybe your doesn't have the same limitations or you don't care about power consumption.
November 19, 2008 6:36:58 PM

About the performance difference a lot of people would say it's better to have 3.4 at 8x (as you are now) than at 9x. That's because at 9x the FSB is lower, therefore your memory works slower. Anyway in real apps I've read the difference is insignificant.
November 19, 2008 6:57:37 PM

that makes sense. So i were to find a stable OC at 3.4 (425x8) then I couldn't enable Speedstep.

I just had a go at 450x8 but crashed after a few sec in Prime using 1.38v

tried 375x9 but also crashed using 1.38v.

Now using 425x8 again at 1.35v and only getting max core temp of 62, avg 57C. only been going 15min so far though.
November 19, 2008 8:33:50 PM

425x8 seems to be your best choice if it fails you can always use a little more voltage, with temps below 65 and CPUZ telling you it's less than 1.35v I believe you're safe.
Also remember to test the RAM since 450fsb goes beyond DDR2 800 (PC 6400). Don't know what RAM you are using though.
November 19, 2008 8:55:37 PM

I have 2x2gb 1066 ram and with 425x8 it runs at 1061 or something. I'm happy with that.

i increased to 1.36v and it failed after about 45min. temps still only hitting 55-62C on all cores.
November 19, 2008 9:13:39 PM

Don't worry much about voltages below 1.4 if CPUZ is telling you you are getting less than 1.37 (with prime test on) and with temps below 65.
November 20, 2008 12:34:44 PM

The longest i've had on Prime so far is only 45min - BSOD. my other voltages were very high so i thought rather than a quick fix I would trim the fat on all my voltages.

i'm currently trying CPU at 1.3625v, VTT on 1.32v, GTL_REF on +50mv, everything else is on auto. Although this seems pretty stable during normal conditions Prime only last a couple min.

Am I correct in assuming that if I am running at a lower Multiplier and higher FSB my ram will run quicker and therefore i would require a higher voltage on the NB?

I'm amazed at how low my temps are running just 0.2ghz slower even when i ran 3.6 on the same voltage.
November 20, 2008 5:56:35 PM

1) Yes, your NB is working harder at 425 fsb than at 400, therefore, it needs more power and most likely more voltage.
2) you should use high (but safe) voltages on everything, mainly NB, RAM and CPU when you make sure the system is stable, you should start lowering one by one until you find the lowest stable voltages possible for your desired speed.
3) don't know much about VTT and GLT_REF, so don't know what to advice on them.
4) it will be of much help if you find someone with the same MOBO and CPU and ask him his OC'ed settings
November 20, 2008 8:39:29 PM

Ok I thought that may be the case - I might be learning something afterall!

I've started low (or Auto) on everything and then just increased one voltages setting little by little until i stop getting marked improvment.

My mobo only seems to like voltages within a certain range, i.e. I am stable at 3.0ghz with 1.2625v but unstable at 1.3v. I don't know if this is normal. I've read a few forum reviews by someone called Lupiron on Tom's hardware who has the same mobo. he Oc'd his Q6600 to 3.8ghz but did say that my board was a tough one to crack. I've tried contacting him a number of times but apparently he's not around at the moment. He didn't leave too many clues to his settings but instead helped quite a few from the forums using IM.

I have to say Rojito you've been fantastic help! I really appreciate it.

I'm currently running Prime again with a higher NB (1.46v) so far so good - fingers crossed!!!
November 21, 2008 2:32:04 AM

It's normal to have trouble overclocking, it takes a while to really master each board and cpu because they can all be so different. Just keep at it and don't do anything drastic and you'll get it. Took me like a week or 2 to really get how to OC my Q6600 with my msi650, but I finally got it to 3.2 24hour prime stable and it felt so good to be done with it. The funny thing is I don't even see much of an improvement in real world performance, only in benchmarks so I don't even keep mine at 3.2, I just leave mine stock.
November 21, 2008 4:27:15 AM

Thanks for the compliments, I'm just doing what others have done for me. as liderc said, it's difficult to master oc on each board, but when you do its very gratifying, although I have to differ on the improvement on oc'ed cpu. Ive seen significant improvement after oc on my video editing apps and on my backup app (acronis). It's not like a 1 ghz cpu oc'ed to 2 ghz will be twice as fast but it can be around 60% higher.
November 21, 2008 1:13:57 PM

I'm finding it a real struggle to get past 1 hr on Prime. I haven't checked to see if its the same test that is causing it to crash. I'm using Large FFTS becasue that is what i have used to test on everything other attempt to i may as well keep it fair. Even if it does not "Fully" stress a cpu its enough for me and i have had any problems with my 3.0ghz OC.

Currently testing following:

CPU 1.3625
PLL auto
VTT 1.46
Mem 2.2 (first time i've changed this)
NB 1.52
SB 1.55
1.2HT 1.25
GTL_REF +50

If i don't see a marked improvement i don;t know where to go from here.
November 21, 2008 7:16:34 PM

I managed about 30min with the settings above!

I'm going to have a go at adjusting the PLL (slightly) - apparently its not wise to go too high on this one.

Settings above seem pretty solid running everything else. System feels like its running faster. Benchmarks are good too.

Does anyone know what is the highest i could go to on the NB & SB? my bios displays voltages in green (for low), Yellow (medium) and Red (hot). Apart from VTT (yellow from 1.42) i am on/near the Green limit on all voltages.

I really don't want to be beaten by this board. i just know my chip should hit 3.4ghz (3.6 with better cooling).
November 22, 2008 1:14:59 PM

STABLE @ 3.4GHZ!!!

Ran 6hrs+ on Prime with Zero errors on all 4 Cores. I know in the Grand scheme of things its not as long as it should be but that's enough for me.

I've settled with the following:

CPU 1.375v
PLL 1.6v
VTT 1.46v
Mem 2.2v
NB 1.58v
SB 1.55v
1.2 HT 1.25v
GTL_REF +50mv

using 425x8

Now, do I try and reduce the voltages? NB is v.high, so is VTT and PLL. I did make a big jump on the CPU voltage too.

I could think now "if its not broken, don't fix it" but if i thought that i wouldn't have overclocked in the first place!

Thanks to everyone who helped me out - you've all been great.

Also, found the Xigmatech cooler online at a good price so i may be investing on one if it will fit inside my case.
November 24, 2008 12:53:25 AM

Grats, although I would suggest nothing less than 12 hours. I would work on your vtt and n/s bridge, looks like they are a bit high for a Q6600. What seemed to give you the most stability, did you raise a few voltages at the same time ect...

It's best to move one voltage at a time that way you can find out what really increased your stability. I would imagine you don't even need the high north and southbridge voltages, but you obviously raised them for a reason.

Everything else looks pretty good, if you can't get the n/s bridge lower make sure to watch the temps on those, your north bridge can get very hot at such a voltage.

Good luck and glad you've found some success, it's nice huh?=P
November 24, 2008 7:22:44 AM

My approach was initially to start with every voltage on auto (i did keep mem to 2.1v because OCZ rec' 21.-2.3 for my dimms) and increased one voltage a few steps at a time until a marked improvment was seen. I then continued increasing the same voltage at smaller increments until there was no further improvement.

I started on the CPU Voltage followed by VTT, NB, GTL_REF, SB, 1.2HT, PLL and finally Mem. I did it in that order from previous experience of what made bigger differences.

I then repeated using fine adjustments on voltages i felt were too high/too low until i reached the settings above. I've recorded every set of voltages i've tried at different FSBs, etc showing results on weather or not system posts, boots into vista and Prime running times. It taken a while!

I agree, the NB and VTT does seem high. i've tried dropping the NB and the best i could do was 1.5v on the NB which completed over an hour on prime but i had to go out for a while and wanted to keep an eye on things so i shut down the system. When i came back reboot failed so i assume its not that stable afterall.

I tried dropping the mem voltage back to 2.2v but this made the system unstable too. I may try bringing NB and Mem voltage down together.

The NB does get very hot to touch if i do not have my case fans set to 100%. I'm not sure which is the temp reading in HWmonitor for NB or SB but I have seen one reading that increases in a linear fashion to PC Probe's Motherboard Temp. PC Probe reads motherboard temp at over 45C when case fans set to Q-Fan mode and only 28-33c when fans set to 100%. HWmonitor shows one temp that increases/decreaes at ~8C lower than PC Probe.

Yet to try lowering VTT but it is on my list to do.

I do agree with comments on 12hr+ on Prime but I am still fearful of temps going too high. On the settings above temps stayed around 60c on all cores for the most part of the tests. However, I left it to it unconcerned about temps even reaching 70C and came back and saw HWmonitor showing a max temp reaching 80C on cores 0&1!!!! Current temps in the 60s at the time though. I allowed the test to carry on and i noticed that temps dramatically increased during only some tests at 192k and 128k (i think, the ftts in the 100's anyway). The temps just shot up and stayed there for a few tests and then dropped back to acceptable levels for a few tests and increased dramatically again.

So i am reluctant to test for too long until I believe i have everything just right. I have to say though that the above settings haven't crashed at all (so far).

I am going to purchase some AS5 paste - after reading up on AS5 i now know that i have more than likely "Fudged" up my thermal paste application! I put on way too much!

I've also may buy a new cooler which is apparently much better than my current cooler and much cheaper too! I just hope it fits into my case.

I was going to ask someone about the relationships between voltages. For example, SB and 1.2HT are fairly stable on auto. Increase one of them on their own and system won't boot but increase them together (1.2HT requires a few more clicks) and system becomes stable. Are there any other known voltages that work better if increased together? Because this may be why i cannot lower one voltage too much because other settings are preventing it. This is why i am going to look at lowering Mem & NB together.

Thanks again and Yes its nice knowing i've found some success!
November 24, 2008 2:00:32 PM

if those are your lowest stable voltage settings, I believe you should keep them. You're using a fsb of 425 so your NB needs more voltage. And if the MB isn't capable of keeping the ones you set on BIOS stable (you said you used a voltage and CPUZ said it was lower), That's why yours are so high.
Anyway, you should consider 2 things.
1) do consider buying that Xigmatek HSF it will definitely let you get 3.6GHz and at 9x, which means less fsb (400 vs 425) wich means less NB Voltage. And lower temps too.
2) Buy a small 40cm fan (there are some Scythe ons that are completely silent) and attach it to the NB (I used red silicone on mine). Remember that the stock cooler throws air directly into the NB but most after market coolers don't, that's why it's getting so hot.
November 24, 2008 9:33:20 PM

I ended up buying the Xigmatek Cooler and also some AS5 thermal paste. The two came to less than what i paid for my current cooler so i hope to sell on my current one and get at least some money back for it.

I may have a look at the additional fans too, especially if they run quieter. My system isn't too loud but on q-fan mode it was virtually silent and that was nice!
November 25, 2008 2:08:11 PM

Perfect, go ahead and install it and report your new temps and if you are planning on new attempts to OC higher than 3.4 (I would say you could reach your desired 3.6 at 9x 400 fsb with good temps).
November 25, 2008 4:01:46 PM

Glad to see you got a new cooler, hope it drops the temps some so you feel better about leaving prime on. I was the same way=P I would put it on and go to bed and get up every few hours checking if it failed/temps, was a very sleepless week when I oc'd mine.
November 25, 2008 5:44:56 PM

Hopefully they (AS5 & Cooler) should arrive in the next day or two. When they do I'll start testing again at 3.6ghz.

My 3.4ghz OC doesn't seem to be stable anymore (struggles to boot). I was trying to fine tune the OC on my GFX card and after a few restartes it wouldn't always boot into vista. i guess that shows how important it is to complete longer tests in Prime when settling on OC settings.

So i'm back down at 3.0Ghz which is actually pretty good and runs prime 24hrs+.

I'll post when i get my new cooler inside.
November 27, 2008 3:27:59 PM

Arrived & Installed!!

was quite easy installing the new HSF but was a pain having to remove the old one (had to remove everything and take out motherboard).

My 3.4ghz settings started working again but now i've the new cooler inside its not working now.

I tried my settings for 3.6ghz (best ones so far) and temps seemed impressive. idle not really different to Silent Knight but under load Prime Small ffts temps only reached 62C on one core rest were low to mid 50's. IT did crash my system after 15-20min though but screen froze so at least i could see my temps before resetting!!!

I read somewhere (think it may have been an article on Tomshardware) about coolers and overclocking. I recall it mentioned that a poor cooler will allow the CPU to run hotter at a given load and therefore require more power to maintain stability. Is this true?

If that's the case then i'll look at much lower voltages for a 3.6ghz OC.
November 28, 2008 7:52:03 PM

rob_cunningham said:

I read somewhere (think it may have been an article on Tomshardware) about coolers and overclocking. I recall it mentioned that a poor cooler will allow the CPU to run hotter at a given load and therefore require more power to maintain stability. Is this true?

If that's the case then i'll look at much lower voltages for a 3.6ghz OC.


If your comp is crashing it should be a component needs more power to run at that speed or it's overheating.
We know with your current HSF your CPU is not overheating, and at 400 fsb your NB shouldn't be ether (unless you are using too much voltage on the nb)

please tell us your voltage settings. --> NB, SB, CPU (both on your MB and CPUZ (at load)) and ram

If your MB is failing to give enough and stable power to any component your computer will crash.

Also try doing a blend test so you can be sure it isn't the RAM that's failing (blend tests stresses your memory much more than small ffts)

Finally tell us which PSU you are using.
November 29, 2008 6:32:35 AM

Hey,

at 3.6Ghz I have the following settings at present: ( i have stress tested yet though)

All in Bios:
CPU 1.3875v
PLL 1.6v
VTT 1.46v
Mem 2.2v (timings 5-5-5-15-2T @ 1066.7)
NB 1.52v
SB 1.55v
1.2HT 1.25v
GTL_REF +50mv
Loadline Calibration is Enbabled

CPU Bios settings of 1.3875 gives me a Vcore in CPU-Z of 1.328v

Settings are too different to what i was using for 3.4ghz @ 425x8. I've spent the last day trying many different combinations to try to get NB and VTT lower.

I'm using a BFG ES800w PSU - http://www.bfgtech.com/bfgr800wespsu.aspx

I've had a bit of a read up on Lupiron's Post to tr and find out what voltage settings he was using -

http://www.tomshardware.com/forum/247451-29-ordered-p5n...

Same mobo, same chip and he was able to get 9hrs (with zero errors) stable in prime using the following bios settings:
CPU 1.4v (CPU-Z Vcore 1.312v)
VTT 1.3v
NB 1.42v
GTL_REF +50mv

I've tried setting my NB and VTT that low but it won't get stable in Vista. He used a Q6600 with a VID of 1.2000v - mine is 1.2500v, which from what i hear is not bad. Becasue there is a 0.5v difference in our VIDs should i be looking at increasing my Vcore (read by CPU-Z to be 0.5v higher than his?
His Vdrop was far worse than mine but he seemed to manage it ok.

Any ideas/suggestions always welcome. Thanks again.

Ps. i'll stress these settings now and repost (when it crashes!) i'll test all 3 (small, blend and large) and give comparsions.

November 29, 2008 7:16:06 AM

Ok,

Prime Results (using settings above):

Small ffts <5sec
Blend ~15min (restarted while i was away), Temps <60C on all cores
Large ffts Core 3 failed after 2min, Temps <60C on all cores

Can anyonne shed any light on the subject?

I'm assuming increase CPU voltage.
!