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Guide to Overclocking the Core I7 920 or 930 to 4.0ghz - Page 38

post #371 of 1477
I got my cpu clocks up to a stable 4.01GHz very easily, Have my ram speeds at about 1100 MHz with a 6x multiplier and the vdimm voltage at 1.66v and IOH and ICH at 1.22v and QPI at 1.355v. I can run prime95 in small FFTs for days without any problem and 10 or more passes of memtest with no errors (even ran memetest at a 8x ram multiplier it ran 5 passes with no errors) But this is my problem if I run a blend test of prime95 it bluescreens(124). It takes between 2-6 hours to bluescreen. Never bluescreens within first hour and a half of starting. Any ideas??? With this overclock being so close to stable I know it can't be anything major.
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post #372 of 1477
I recently overclocked my Core i7 920 D0 using the guide in this thread as a template. I was a little apprehensive about hitting 4.0Ghz even though I have a D0 ('09 batch) so I decided on 3.8ghz. Here are my settings:


IOH - 1.2v
ICH - 1.2v
Ram - 1.64v
CPU PLL - 1.88v
QPI/VTT - 1.30v
V-Core - 1.25v

19x (Turbo mode off)
200 Base Clock

I tried running it a couple of times with v-core at 1.2 and 1.225 and as soon as I ran a blend test in Prime95 the computer shut off both times. Granted, I had turbo on, I turned off turbo, bumped the v-core to 1.25 and ran this test. Results are posted in provided pic. One thing I'm a little concerned about is my temps. I'm using the Megahalems in push/pull. My case is pretty small however, so I think I'm not getting as good airflow as I should be. Are my temps ok? How does my processor overclock? Also, why is it that although I've set my v-core to 1.25, under load it is only going up to 1.168v? It's odd because after the test, it actually went back up to 1.216v on idle. Any ideas/things I should know about? Thanks for all the help.

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post #373 of 1477
Nevermind guys, I figured it out. My power supply didn't have enough juice. I got a Thermaltake 850w ThoughPower PSU yesterday and ran Prime all night and on through today and came home from work and it was still running with temps of about 67c.
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post #374 of 1477
I am in the process of testing my system for stability. Even though Prime95 has only been running for an hour I have experienced no problems! I hope that result continues for the next 23 hours!

Anyway, I wanted to say thank you for this guide and for sharing it with us. THANK YOU!

I have a question:

I am watching the process using CPU_Z and Real Temp 3.4. Real Temp shows 190.2 x 20.1 and CPU-Z shows 3999.5 x21 right now (in real time). But, both programs show these two numbers changing (goes from x21 to x 20 and then back again). Does anyone know why?

See specs below!

Thanks,

Murray
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post #375 of 1477
Quote:
Originally Posted by chadamir View Post

Q: What is this multiplier throttling I've heard about?

A: Some boards will throttle down the 21x multiplier if the wattage becomes too high. The culprits without public fixes are the Asus p6t deluxe and vanilla (The deluxe v1 has a bios available on the xtremesystems forum which can be crossflashed onto the v2 which will fix this problem) It really only becomes a problem at high voltages with high frequencies. Other boards have ways of disabling it.

[/B]
I was planning to buy the P6T. And i want to use the 21x multi as it seems easier for everyone. Should i get the P6T deluxe V2 then ??
Edited by Grindhouse - 2/14/10 at 4:11pm
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post #376 of 1477
Does someone know if the current P6T/P6T deluxe V2 have the lastest BIOS, 6xxx i think ? Or do they still ship with old BIOS from one year ago ?
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post #377 of 1477
Thread Starter 
Murray, what are your temps? Your cooler is not really meant for much in the way of overclocking.

Grindhouse, They will ship with whatever was current at time of manufacture.
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post #378 of 1477
Quote:
Originally Posted by chadamir View Post
Murray, what are your temps? Your cooler is not really meant for much in the way of overclocking.

Grindhouse, They will ship with whatever was current at time of manufacture.
Yea i guess :/ Do you think the ones they sell today on newegg were made like 3 months ago ? Or more like 6 months ago ?
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post #379 of 1477
Quote:
Originally Posted by chadamir View Post
Murray, what are your temps? Your cooler is not really meant for much in the way of overclocking.
CPU with VCORE at 1.275 ...

Idle: 40C to 43C
Load: 63C to 68C

(While running Prime95)

Keep in mind that the CPU is "throttling down" to x20 from x21 at times (as mentioned above)
Edited by MurrayCYHZ - 2/15/10 at 6:45am
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post #380 of 1477
awesome guide + rep
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