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I7 920 Stable 4 ghz (20x200) for only 5 hours..

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February 3, 2010 3:08:40 AM

Hi all,

Just as the title says, I can only get it 4ghz (200x20) to be stable for about 5 hours or so with prime95. My system specs are:

i7 920 D0
ASUS P6T
Corsair TR3X6G1600C7D
Coolermaster 850W PSU
CM Sniper Case w/ R4 90 CFM 120mm fans for Intake/Exhaust (so I have high airflow)

Right now I have it rock-solid at 3.8 ghz with the following changes to the Bios.

Multiplier = 19
BLCK = 200
VCore = 1.25
DRAM Bus = 1.66
QPI Dram = 1.375

Everything else is on AUTO. I'm using the X.M.P on my memory which gives it the 7-7-7-20-2T timings. However when I up the Vcore to 1.35 and Multiplier to 20x I can only get it to stabilize for 5 hours. I know my CPU can handle it but what changes should I make?

My CPU temps
3.8 ghz @ 1.25 vcore = 67 celcius running prime95 for 8+ hours. Using Zalman CNPS10X Quiet

4.0 ghz @ 1.35 vcore = 80 celcius

I just got a Prolimatech Megashadow today so I'm sure I can drop that by a few more but I don't think temperature is the problem? Thanks in advance.

a c 125 K Overclocking
February 3, 2010 10:24:30 AM

Try relaxing your memory timings

BTW 80C is to hot, You shouldnt really be going over 72C
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February 3, 2010 1:37:44 PM

THanks, I'll give it a try. Just installed Prolimatech but I think I seated it wrong , the temperature is way too high.
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a b K Overclocking
February 3, 2010 5:34:39 PM

You will also wanna raise your vtt, it is called QPI/dram on your board. If you dont you will be stressing that memory controller and it will break overtime. Just raise it a little to 1.275 or so.
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February 3, 2010 5:56:26 PM

overshocked,, that qpi/dram voltage,, what is the maximum recomended for that?

wel i can now reach 4.4 with 1.4 qpi dram!

this chip needs more vcore though!!

for ich and ioh is it ok if i have them at 1.3?
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a b K Overclocking
February 3, 2010 6:10:36 PM

I believe the max safe for VTT (qpi/dram) is 1.55, but i have also heard 1.6v.

ICH i usually leave at 1.225 as it doesnt do that much for overclock (below 220 bclock) but IOH i like to have a little higher, like 1.275-1.325
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a c 125 K Overclocking
February 3, 2010 6:20:36 PM

no maurick dnt overclock anymore, you'll beat me in the ci7 overclockers club : /

Please !?
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a b K Overclocking
February 3, 2010 6:21:55 PM

maurick said:
overshocked,, that qpi/dram voltage,, what is the maximum recomended for that?

wel i can now reach 4.4 with 1.4 qpi dram!



Maurik, can you give me CPU-z validation please, so i can add you up in the OC club. [:lectrocrew:6]
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February 3, 2010 7:06:41 PM

ok ok
i'm booting now!

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a c 125 K Overclocking
February 3, 2010 7:50:07 PM

tHIS MEANS wAR!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

:D 
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February 3, 2010 7:53:48 PM

Rustyy117 said:
tHIS MEANS wAR!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

:D 

lol!!!!
:sol:  :sol:  :sol: 

i can boot now @ 4.6 but it freeze after 1 minute!
damn it!
just a little more tweak and i can get it!

we can help each other though,, u want to?
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a c 125 K Overclocking
February 3, 2010 8:19:36 PM

Yeah alright, I'll give you some motivation haha

Can you take a screenie at 4.6Ghz?
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February 3, 2010 8:22:29 PM

naa i cant even click the cpu z man,,it freezes!
i think i need 1.53 on that speed!

how far u oc urs?
can u pm ur settings'???

i need some reference!haha
no cheating
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a c 125 K Overclocking
February 3, 2010 8:38:38 PM

Yeah I'll send you my settings for 4 ghz and for 4.2ghz, but how do i send a PM (Lol I've been here for like a year and 6 months and dnt know how to send a PM :p  )

Please dnt use 1.53V :o :o :o :o :o 
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February 3, 2010 11:54:58 PM

Tried to relax the timings to 9-9-9-24-2 , crashed again over night, not sure how long it went. Gonna try Overshocked suggestion.. btw.

If my computer can boot at 211 blck, does that mean it has the potential to go up that high? Or if it doesn't boot at all means that my computer has a blck limitation. Thanks forthe replies.
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a c 125 K Overclocking
February 4, 2010 7:45:31 AM

Try setting your uncore multi at something low like x13, I had trouble getting to 4Ghz because my uncore was to high. All I had to do was turn the multi down and it was peachy.

Maybe raise your VTT to 1.315V. Keep your memory timings loose, So that you know your memory isnt causing stability issues.
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February 4, 2010 9:32:47 AM

I've set my QPI/DRam to 1.35 and still crashing. I've also upped my Vcore to 1.33.. because I keep getting the 124 error on restart. I know that some 920s can go to 4ghz with only 1.28 or so but I guess my core isn't one of the lucky ones.

Would having too much Vcore cause crashes? Or can I safely go to 1.35 and tweak the other variables knowing that 1.35 on Vcore SHOULD eliminate the possibility of it bring the problem.
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a c 125 K Overclocking
February 4, 2010 10:06:36 AM

more vcore will most likely help, try 1.35V, although that is alot for 4Ghz, Mine does 4Ghz with 1.25V
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February 4, 2010 12:26:58 PM

Yah... T_T mine doesn't even boot with 1.25 @ 4ghz. So far 2 hours with 20x200 with 1.33 vcore.. lets see if this can go past 7+ hours. Thanks for the info. Temps are around 72c. Think I can get it a bit lower some how..
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a c 125 K Overclocking
February 4, 2010 12:35:55 PM

72C isnt to bad, Prime95 will stress your CPU more than anything else so its highly unlikely that it will ever get that hot under normal use.

Good luck mate, hope its stable.
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February 4, 2010 2:23:42 PM

By the way, if get the CPU stable with the current V.Core. Next would be to tune the memory timings... What would I have to adjust to get better timings? Right now I'm at 9-9-9-24-T1 @ 1603mhz. Would like to get it a bit lower like 8-8-8-20-T1...
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a c 125 K Overclocking
February 4, 2010 2:42:13 PM

well thats easy if you now the CPU is stable, Just put the voltage to 1.64V and set the timings to 7-7-7-21 which I think your RAM is rated at (you might want to double check that)

Then run the blend stress test on prime 95 for 8 hours or so.... If it fails then you know what to do .... set the timings to 8-8-8-24 and test again.
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February 4, 2010 11:05:04 PM

My CPU needs more than 1.35VCore for even 3.9 GHz with 19*205. I need better cooling to go any further. I have C0 stepping CPU and some people need up to 1.4Vcore to reach 4.0 GHz. I'm not comfortable with my temps at 80-85C so I'll stick with 3.7GHz @ 1.3VCore.
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a b K Overclocking
February 4, 2010 11:26:12 PM

Yeah, actually ive never needed more than 3.6ghz for gaming and everyday use.
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a b å Intel
a c 151 K Overclocking
February 4, 2010 11:44:28 PM

Oatmealz said:


My CPU temps
3.8 ghz @ 1.25 vcore = 67 celcius running prime95 for 8+ hours. Using Zalman CNPS10X Quiet

4.0 ghz @ 1.35 vcore = 80 celcius

I just got a Prolimatech Megashadow today so I'm sure I can drop that by a few more but I don't think temperature is the problem? Thanks in advance.


With the Megashadow, we're at:

3.7 ghz @ 1.125 vcore, DRAM 1.564 = cores range from 54-58 C running prime95, HT and turbo enabled

4.2 ghz @ 1.300 vcore, DRAM 1.564 = cores range from 70 - 74 C running prime95, HT and turbo disabled

4.3 ghz @ 1.350 vcore, DRAM 1.564 = cores range from 65 - 70 C running OCCT, HT and turbo disabled

4.4 ghz @ 1.240 vcore, DRAM 1.64 = cores range from 66-72 C running OCCT, HT enabled, turbo and other odds and ends disabled


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February 5, 2010 1:58:29 AM

Just hit 4.0 stable (20x200) with V.core @ 1.33, DRAM 1.66 @ 1603 7-7-7-20-2n
Speedstep disabled, HT ON.

That's strange, how did you hit 4.4 with a lower Vcore than you did with a 4.2? I tried to push it to 4.2 and it won't even last a minute using prime95. I upped the Vcore to 1.36 and still no luck. It did last about 2 minutes though hehe.

Gonna try up to 1.4 vcore when I get home tonight. Damn I hate overclocking... just when I thought I would be content @ 4ghz!
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a b K Overclocking
February 5, 2010 2:20:53 AM

Depending on what your qpi/dimm is at, you may want to raise it a bit more.
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a b å Intel
a c 151 K Overclocking
February 5, 2010 1:59:11 PM

Oatmealz said:
That's strange, how did you hit 4.4 with a lower Vcore than you did with a 4.2? I tried to push it to 4.2 and it won't even last a minute using prime95. I upped the Vcore to 1.36 and still no luck. It did last about 2 minutes though hehe.


Note the BIOS notes....have several items disabled......didn't run Prime 95 ..... I wish i had overshocked's dedication :)  Until the last build my OC efforts were limited to "what I could accomplish in 10-15 minutes. Last build was a joint effort w/ my now legally adult teenage (18) son. ANytime a teenager wants to spend time w/ his Dad .... those are rare moments to be cherished :0 .... but he got bored after a couple of efforts and since he wasn't going to use anything but the 3.7 (365/24 profile) and the 4.2 (gaming profile), he had no interest in further experimentation.
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February 7, 2010 8:19:27 AM

Overshocked: What's a safe range to up QPI? I'm at 1.35 right now I've read somewhere 1.375 was the limit?

Sorry for the late reply, my PSU took a dump on me (Coolermaster 850 Real Power Pro), so I went out to get a SilverStone 1000. Wonder if my PSU was limiting my overclock as well since it just pooped... may have caused some errors.. hmm.
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February 7, 2010 12:33:00 PM

Couldn't edit my msg. Anyway, if I see temps like 72 74 69 74, while running prime95, it means that my thermal compound is all screwed up right? Theoritcally I should be able to get all the cores closer to the lowest temp?
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a c 125 K Overclocking
February 7, 2010 2:08:42 PM

No its normwal to have differences with individual core temps.
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February 7, 2010 3:15:22 PM

k thanks. Can't get lower than 74 with Megashadow right now =(. Wait for AS5 to cure I guess.
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February 8, 2010 7:53:26 AM

Thanks overshocked, I've read the post and played around with the voltages, it seems the minimum I need for 4ghz is vcore@ 1.34 right now. I had it at 1.33 last night and when I woke up, one of the worker stopped working. I've read somewhere that the Vcore would needto be bumped up a notch.

My temperatures are pretty crappy, 81 82 76 77 even with a Megashadow (Megahalem). I'm using the CM 90 CFM 19 dba fan in a push / pull configuration for it. These are the 90CFMs I know there are 69 CFMs out there as well that spins @ 1800 RPM I think.. read it somewhere on the coolermaster website. Think I should invest in a Scythe Kaze static pressure 3000 rpm fan..
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a b K Overclocking
February 8, 2010 7:59:40 AM

The temps dont make me feel so good, did you try to compensate vcore with a little vtt or qpi?

That will bring your temps down a little.

Investing in a better fan wouldnt bring down temps considerably as you already have some nice fans on there.
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February 8, 2010 9:20:53 AM

Well my QPI is already at 1.375.. not sure how much higher I should go. I'll give it a try though. I must have a really bad D0 because with 1.3v I can only Prime for about 3 minutes before it crashes on me =(.
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a b K Overclocking
February 8, 2010 9:29:48 AM

Yeah, i wouldnt go any higher on QPI, try a little vtt though.
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February 8, 2010 12:22:26 PM

Sorry Overshocked, but isn't QPI/DRam Core Volage = Vtt on the AsusP6T motherboard? Or have I mistaken something this whole time.

I've also been getting error code 124 and I've read somewhere that it's because there's too much/little QPI. Is that true? Error 101 seems to be not enough Vcore but I never got that message. Rather, my windows just doesn't boot up.
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