Sign in with
Sign up | Sign in
Your question

Gigabyte P35-DS3L fsb overvolt question

Last response: in Overclocking
Share
July 5, 2008 10:23:19 PM

Hi, with my Gigabyte P35-DS3L and q9300 i can only reach 400 fsb if i add +0.3 v to the fsb. My question is that that kind of voltage is safe for the chipset? Will it degrade acceleratedly? I am planing to keep this config for 3-4 years.
July 5, 2008 10:50:02 PM

Uhh.. that really depends on your CPU, and boy, that poor 45 MN processor of yours! With that FSB term Voltage up that high, it may not last long!

You need North Bridge voltage for maintaining a higher FSB, and a lil PLL if it gets higher than 400.

You may wanna list the rest of your gear here.

With VTT (FSB termination voltage) up that high, your poor processor will receive 1.4 volts of power to the chip anyways, each and every time it switches from a low logic state to a high logical state.

A special device within the chip "pulls" up the voltage to VTT each time it wants to enter a high logic state.

Try NB to +.2 (gmch?) And PLL to 1.55.

Like I said, you may wanna mention your gear, and what else you have tried!

--Lupi

Basically what you did is widen the margin of error the chip can accept before making a wrong calculation. You didn't address the actual problem.
Related resources
July 6, 2008 1:28:40 AM

Smart fellow there! ^

Thats right, shove voltage through the processor to support your FSB speed!

To hell with that North Bridge!

All he did is widen his threshold to accept errors, with Voltage!

Not help stabilize the FSB speeds with the correct things!

NEED the rest of his gear!

--Lupi
July 6, 2008 8:33:20 AM

So My board is Gigabyte P35-DS3L and cpu q9300, ram 2x2 gb kingmax 800 mhz, ati hd4850, Seagate 500 gb hdd, Samsung dvd rw, Thermaltake 470w power supply. I have tried 400 fsb with fsb +0.2 v, gmch +0.2 v, ddr +0.2 v comp freezes after 2-3 hours of stressing. I tried adding +0.1 v to pci-e but that didn`t help. I tried raising my cpu voltage up to 1.25, no stability with that voltage either. I am rock stable with 380 fsb 1:1 ratio ddr2 with +0.1 v, fsb +0.1 v, and every other voltage at normal/stock(not auto) including cpu. But if i try 385 fsb even with raising fsb, gmch, cpu voltages i can`t get stable. I have a cheap motherboard, so it doesent have option for raising vtt, pll. (i have the folowing options: ddr overvolt max +0.6, fsb overvolt max +0.3, gmch overvolt max +0.3, pcie overvolt max +0.3, cpu overvolt max 2.0 v) I have an Arctic freezer pro (pretty good cooler), and for the northbridge Cooler Chipset Thermalright HR-05 SLI IFX 2 Heatpipes, Cooperbased, 0db, 87X62.5X105 mm.
July 6, 2008 8:46:01 AM

Can you run Core Temp or real temp and list the VID of your processor?

--Lupi
July 6, 2008 9:14:10 AM

My vid is VID = 1.2250
July 6, 2008 9:32:16 AM

You will more than likely have to raise your CPU voltage up more, since your starting VID is 1.2250

You need test VDrop and droop... First, enable load line calibration if your board has it!

Then boot into windows at stock speeds, using 1.2250 as your VCore, manually entered, and make sure speed step is off, as well as eist!

Then using CPUz, after booting into windows, look to see what it lists your Core voltage as, list that here.

then run Prime 95 small FFTs torture test on all the cores, and list the core voltage CPUz lists after running it for a couple minutes, the lowest you see it flicker too, even if it ends up higher.

After that, we can go for a new CPU voltage, and lower that FSB voltage. (FSB voltage is VTT, The front side bus termination voltage.)

--Lupi
July 6, 2008 9:38:38 AM

Let me put it this way. If your FSB voltage is up .3 volts from its 1.1000 then that means your processor is receiving 1.4000 volts to it no matter your VCore.

So we wanna at the least balance them out.

--Lupi
July 6, 2008 9:59:07 AM

You said that your Computer freezes after 2-3 hrs.
What temps are you getting?
Your memory how are you strapinging it? you mite need to just OC the cpu first and get that stable be for you try your GPU and Memory.
July 6, 2008 10:13:31 AM

I have done everything you asked: my idle voltage is 1.216 an load voltage is 1.184v
July 6, 2008 10:15:29 AM

My temps in real temp are 60 c under load for all 4 cores, and my northbridge is max 43 c
July 6, 2008 11:02:56 AM

Yup, can you check and see if you have Load Line Calibration in your Bios? if you do, enable it, and it should take care of some of that voltage drop.

if not, you prolly just needed more voltage. You said you placed it at 1.2500 in the Bios? It's VID is two notches under that, so it prolly needs a bit more.

If you have Load Line calibration, you can just test with it enabled, but if you don't, you have to take into account that of that 1.2500 you set in the Bios, all your CPU is getting while under full load, The time it needs the most, is 1.184.

See how that could be too low for your speed you were running at?

If you have the Load Line, you can run the Vdrop and droop tests again to see the new results, and they will be much better than last time.

We use that lowered during testing voltage, Loaded, to mean after YOU have corrected for your mother boards drop and droop, it needs that amount at whatever speed to run small ffts on all the cores for 8 hours.

If you dont have it in the Bios, try 1.3250 in the Bios, for a lil over 1.25000 while loaded and then just up the FSB till it fails after a while of testing.

So you make the speed equal the voltage.

--Lupi
July 6, 2008 11:08:31 AM

no i got the 1.184 v with 1.225 v set manually in bios not 1.2500 v
July 6, 2008 11:09:05 AM

i have no loadline calibration in my bios
July 6, 2008 11:10:41 AM

Try lowering the VTT to 1.2000 or so, and then raising the VCore +.125 (so if its a 1.2250, it should be 1.3500)

gMCH to +.2

Then the 400 FSB.

--Lupi
July 6, 2008 11:12:42 AM

Then try 1.3250 for about 1.28 loaded.
July 6, 2008 11:27:19 AM

No luck, after windows starts imadiate freezing
July 6, 2008 11:29:26 AM

i can`t set vtt just to normal or +0.1, +0.2, +0.3 v and that`s it, I don`t know the normal value for my fsb speed
July 6, 2008 11:30:22 AM

I don`t know the normal value for my fsb voltage
July 6, 2008 3:12:43 PM

Try just +.1 I believe the norm for 45 NM is 1.1000, so that should be 1.2000. Weird, huh?

--Lupi
July 6, 2008 7:45:42 PM

I leaved cpu overvolt on stock, fsb +.01, ddr +.1, gmch +.2, stable after 2 h of occt (still running) 390 fsb, not 400 but almoust. Thank you all for your help specially for Lupiron. (i have learned today new things with this overclocking)
July 6, 2008 7:56:59 PM

I've got the GA-EP35-DS3R, and have similar settings. 400FSB seems to be about the max I can get stable.

I have MCH +.3V, FSB + .2V, DDR +.3V (which is the rated voltage for my units: 2x2GB G.Skill 1066 5-5-5-15 @ 2.1V).
I have the Q9450 and have to volt it up to 1.26 or so in bios for stability.
Coretemp listed VID = 1.2375V.

Under full load, CPU-Z lists core voltage at 1.200V, and at idle it gets as high as 1.232V with the multiplier dropped fro 8 to 6 - Speedstep is on.
July 6, 2008 8:13:39 PM

Even if you have Loadline Calibration, you wouldn't want to turn it on - read this Anandtech article: http://www.anandtech.com/cpuchipsets/intel/showdoc.aspx....

I would think that the VTT voltage would only put extra voltage on the memory interface portion of the chip - I don't know if this portion of the chip is more or less susceptible to electron migration, but I would think less, as the circuitry should be much less complicated.

Edit: I found that I could reduce my FSB to only +.1V and keep stability. Thanks for the info Lupi - it got me thinking about the problem at a more fundamental level.
July 7, 2008 9:25:02 AM

Yes, that article describes what could happen if you enable load line calibration, and it disables all of vdrop and droop. Most don't, and also, as over clockers, especially higher, you don't take the "norm" ideal for what is good with that chip of yours. You want more speed for free!

Also, most mother boards design their load line calibration in such a manner where it is resistant to power serges.

I use it all the time, but I also manually monitor my current voltage to the cores, and it records the max highs and min lows.

The only board I have ever seen a supposed power spike on was an XFX 780i Ref board. HWMonitor would record a Max high of 4.008 volts to the CPU. Dunno if that was a sensor error or not, and no damage was done that I could tell.

But it was also the first and only time that I have seen a recorded power spike. And that board doesnt even have Load Line Calibration, hehehe!

And to FerenCster, if you have any BSODs or anything like that, just up the VCore a notch, and re test!

Glad it works out, almost 400 FSB! better than what it was, especially with that VTT so high. 45 NM chips natural VTT is 1.1000, so 1.3000 would be the max you'd wanna use without having any other choice.

IE, if it doesnt get a high speed any other way, you are left with no choice, if you want a higher over clock, huh? But if there is any other way around it, use that first.

--Lupi
July 12, 2008 5:29:19 AM

ferencster said:
i have no loadline calibration in my bios

correct
ferencster said:
I don`t know the normal value for my fsb voltage

I have the same board:
NB 1.25V (MCH)
SB 1.05

Would SB be FSB? I don't know.
Bios doesn't show voltage values and I got those above from Everest.

July 12, 2008 6:49:45 AM

SB = south bridge. It's not the FSB :) 
July 12, 2008 7:18:49 AM

Isnt the FSB called host frequency, or some shiznit? CPU host frequency?

FSB host frequency?

I dunno!
July 16, 2008 8:03:42 AM

I have NB 1.25V (MCH), SB 1.05, so the +0.3 gmch is safe or not? will it reduce significantly my chip`s(mobo) life?
July 16, 2008 9:07:44 AM

1.55 volts on a NB isn't THAT high... but 1.40ish or a lil more should work for 400 FSB. May need more as you go up.

Just watch the temps as usual.

--Lupi
July 17, 2008 3:45:28 PM

Lupiron, when i set the fsb to 400, i get random look ups. Wich part does need more voltage. I ran prime 95 small ftt-s for 4 hours no error, i clode the stress, and start surfing on the net, or watch movies then comp freezes. Or i enter in a game and after 20-30 min of game loock up (no bosd). By the way i am using vista business 32 bit. If i back down the fsb to 385 or 390 comp is stable.
July 18, 2008 12:57:20 AM

Sorry, been busy!!

What type of GTL and VTT control your Mobo have? (vtt = FSB term voltage on some boards.)

Sometimes freezes can be caused by a low level logic accidentally jumping over GTL's ref point. I have only had those problems on NVidia boards, so it would be interesting to see if your board is having the same problems!

--Lupi
July 18, 2008 7:26:23 AM

So I have +.1v or +.2v or +.3v to the fsb overvoltage. Right now is set to +.1v, ram +.2v gmch +.2v, cpu voltage stock wit c1e + speed step on, fsb set to 387 (2900 mhz with my q9300), if i set fsb with the above settings to 390 or higher i get random freezes (no bsod), but cpu supports 4-5 hour of prime or occt small ftt stressing and temp are in realtemp at 60-61 c. So i dont know why isint stable, if it is stable under extreme testing and freezing while almoust idle (surfing, listening music or watching movies)
July 18, 2008 11:52:13 PM

Na, if i add +.3 v to the gmch instead of +.02v i can get it stable with 400 fsb. My only remaining question is that my board will fry or wear out fast because of the high gmch voltage (intend to use it for 2-3 years at least). I mentioned before that i have decent cooling on my north bridge. So it is safe to use the p35 with 1.55v on it 24/7??? :bounce: 
July 19, 2008 2:41:24 AM

Sure, 1.55 is the upper normal end. Most can get the 400 FSB on 1.40, but going to 1.55 isn't bad. Especially if you have extra cooling for the NB.

One of my boards only has .15 jumps. 1.25, 1.40, 1.55. If 1.40 doesn't work, you HAVE to use 1.55, hehehe!

Just kep an eye on the Temps, the NB can get warm, but it can also take the heat pretty well!

--Lupi
July 24, 2008 1:09:54 PM

Na I have 3 options for raching 400 fsb, witch one is the best?
1. CPU vcore 1.300v (bios), ddr overvolt +.2v, gmch overvolt +.2v, fsb overvolt +.1v, pci-e overvolt +.0v
2. CPU vcore 1.243v (bios), ddr overvolt +.2v, gmch overvolt +.2v, fsb overvolt +.2v, pci-e overvolt +.0v
2. CPU vcore 1.225v (bios), ddr overvolt +.2v, gmch overvolt +.3v, fsb overvolt +.1v, pci-e overvolt +.0v
July 24, 2008 1:12:28 PM

Or the forth (currently testing) 390 fsb:
CPU vcore 1.243v (bios), ddr overvolt +.2v, gmch overvolt +.2v, fsb overvolt +.1v, pci-e overvolt +.0v

Or the fifth 380 fsb:
CPU vcore 1.225v (bios), ddr overvolt +.2v, gmch overvolt +.1v, fsb overvolt +.1v, pci-e overvolt +.0v

Inputs are welcome
July 24, 2008 7:40:20 PM

It's looking to me like you've neglected some settings if you're getting 400fsb stable by changing the CPU vcore.

A very important setting is the tRD value, which in a GA bios is called Static tRead Value or something similar. For more info on the tRD and its importance, check out this article You should manually set this to the lowest value possible. On my EP35-DS3R, I can get an FSB frequency of 400MHz with +.2V MCH, +.1V FSB, and a tRD of 7.

A good idea to find a stable, high FSB is to lower your CPU multiplier to its lowest value and not mess with the CPU voltage. Take the CPU out of the picture first, and find a stable FSB, then once you have the desired FSB, you can boost your CPU multiplier back up and increase voltage until it is stable.
July 26, 2008 7:53:50 AM

zipz0p thank s for the advice, it seems that my board supports 400 fsb with +.1v fsb and +.2v gmch just like yours. The tRD can only be set to 8 to boot. After this i messed with the cpu multiplier and voltage. until 2955 MHZ i only need 1.225v but to get 3000 MHZ i need 1.275 v. Isin`t this odd? How can this be?
July 27, 2008 12:46:31 AM

Intel processors tend to have some overhead in their operating frequencies at their stock voltages. So you won't really have to boost the voltage for the first little bit.

On the other hand, that is a pretty large jump in voltage for a little increase in frequency. Some frequencies are just easier to generate, I think... I'm not entirely sure how clock generation works yet - I made a thread trying to get more insight into its inner workings and the inner workings of the memory controller and FSB signals, but I didn't really get any responses except from Lupi :) 

Edit: oh and one other thing: DS3L boards have fewer voltage regulation phases providing power to the CPU than the DS3R boards (I believe... please correct me if I'm not right about this), and so you may simply have to give it more voltage to get the expected voltage...?
July 27, 2008 1:42:24 PM

Yes my board has fewer voltage regulators. After heavy testing i come to the conlusion that the highest stable overclock is 2925 MHZ with stock voltage (under load 1.18v) to get 3000 MHZ i have to bump it up to 1.275v (under load 1.248) so i decided to leave at 2925 MHZ.
July 27, 2008 11:57:41 PM

So you decided not to run with the 400MHz FSB frequency, I take it?
July 28, 2008 9:15:32 AM

Yeah 2925 MHZ is exactly 390 FSB (not bad for 70 $ board), and I will stick with that. Thank you all for your help (especially Lupiron and zipz0p)
July 28, 2008 9:44:09 AM

Yeah 2925 MHZ is exactly 390 FSB (not bad for 70 $ board with quad core), and I will stick with that. Thank you all for your help (especially Lupiron and zipz0p)
!