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Old December 23, 2008, 01:05 AM
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Location: Toronto
Posts: 115
Default Looking for advice to further overclock Core i7 920

I edited this thread because I managed to achieve about 3.8GHZ (Turbo Mode Enabled)
I want to improve CPU speed slightly and stabilize it well at the same time.
The results are shown in the pictures.

In the BIOS:

Memory Frequency 2:8/1066MHZ (by default)
CPU Clock Ratio 20X
CPU Host Frequency 180
CPU Vcore 1.35V
DIMM 1.65V
PWM Frequency 1067 KHZ
QPI Frequency 4.800GT/S
tCL 8
tRCD 8
tRP 8
tRAS 24
tRFC 74
Command Rate 2T
The rest on auto setting.

A couple of questions:
1.My vreg temperature goes above 70C when doing stress test. Is this safe?
2.Where can I find some guide to voltage control for Core i7 920?
3.Is it better to disable the turbo mode?
4.Does running at 4.0GHZ shorten the life span of CPU?

Comment: I want to set CPU Host Frequency to 190 and be able to run it.
That way my ram will run a bit faster The important qustions is "How can I stabilize my PC afterwards? So far I haven't succeeded in doing this. I even disabled the Turbo Mode and still failed. It will reboot when it starts loading Vista.

CPU:Core I7 920 @ 3.35GHZ + Noctua NH U12P Heat Sink
RAM: OCZ DDR3 triple channel 1600MHZ Gold (8-8-8-24)
Mainboard: EVGA X58 up-to-date BIOS
PSU: Corsair HX 1000W
GPU: EVGA GTX 260 Core 216 SC
Case: Antec P182
Hard disk: Segate 500GB Sata II, Western digital 320GB
OS: Windows XP Pro X86, Vista Ultimate X64 (primary)

Thank you.
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Last edited by appplejack; December 27, 2008 at 08:11 AM.
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Old January 4, 2009, 08:15 AM
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Join Date: Jan 2008
Location: Cambridge, ON.
Posts: 499
Default

Run it for 24 hours on a stress test app, if it will without shutdown of the stress test if it finds an issue.
It will not continue the test if there is an issue.

You can look up the thermal properties and design temperatures on the home site for your intel chip.

Sure you could shorten the life of a few components, not just a cpu, if its not 100% STABLE and COOL continually enough at 4GHz.

I don't have intel but try turb on and off record your results each way.

My humble advice is...don't play unless you can well afford to pay.
or know the ground you walk on
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Cambridge,ON
MSI Z77 M Power/Bios17.13b1
3770K@4.5ghz
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using Prime 95 27.9


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Old January 4, 2009, 01:50 PM
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Join Date: Nov 2008
Location: Toronto
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Default More overclocking done.

I managed to push it a little further and it runs at almost 4GHZ.
I ran Prime 95 or 5hours without any error. But I might need to do more testing.
At the end of Prime 95(64bit) test with 100% CPU utilization , the temperatures were CPU: 54C VREG: 72C System: 30C, Cores Avg: 67C. I will post an image of temperatures at the end of a longer stress test. Here are the results so far.
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Last edited by appplejack; January 4, 2009 at 02:00 PM.
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Old January 4, 2009, 10:50 PM
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Location: Vancouver
Posts: 158

My System Specs

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I read a couple different places that 70-75 should be the max full load temps. Not sure what Vreg temp is but look at the core temps. I would also get a different temp application than the EVGA one. Real Temp, Core Temp, Everest.

Stress testing is a very subjective process. People swear by completely different methods for all sorts of reasons. If you want to be really safe, just do everything. If you want to be realistic then run Prime95 for like 5-6 hours
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