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i7 920 D0 OC Assistance

post #1 of 9
Thread Starter 
Hey guys im new to the forum so I will say "Hi" straight up!

First things first I am no stranger to overclocking and have clocked mostly AMD's and an untold number of graphics cards most recently my 480 GTX BIOS clocked stable at 850/1700/4200 (nothing ground breaking but have the basic knowledge).

I got this i7 build about 7-9 months ago and feel its time now to push it up and on its way but even after various guides my limited i7 overclocking knowledge cant find a solution to my issue below.

The system build is as follows;

Intel Core i7 920 D0 (Watercooled Corsair H70)
Gigabyte X58 UD3R
OCZ Obsidian Black 1600 Mhz
Corsair TX 850W ATX
EVGA 480 GTX FTW (Overclocked)

At current I have a 3.2GHz overclock and 3.36GHz with Turbo and memory at 1600Mhz 8-8-8-24 1T (rest of memory timings are default) however when running Prime95 the "In place Large FFT's" give errors and this is the same in "Blend" but not in "Small FFT's" they can run for hours fine.

I have messed with various settings and this is what ive got so far.

VCore - Normal Intel Spec - 1.26875v
QPI/VTT - 1.315v
DRAM - 1.600V

The CPU/Memory settings are;

20x 160 = 3200Mhz
21x 160 = 3360Mhz Turbo
QPI Link = 5.76GHz
Uncore = 3200Mhz
Memory Multiplier x10 / 1600Mhz

Just to note I am not currently after anything massive for this overclock however id like to be able to run Prime95 on these settings stable and I have to mention I am keen to keep Turbo enabled, C1E and HT

Hope this isnt to much information and look forward to any solutions to my overclock fail!

Jaxxxxx
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post #2 of 9
First of all turn off the turbo when overclocking
Rozpierdalator :D
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Rozpierdalator :D
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Hard DriveOptical DriveOSMonitor
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post #3 of 9
Leave turbo on for the 21x multiplier. Your voltages are actually way too high... try lowering them. High voltages can actually make an overclock unstable as well.
Vcore around 1.2, you can work on lowering it later. VTT at 1.2 as well. You should also be able to leave your RAM at 1.50 with no problems. All this if you plan on staying around 3.2GHz.
Also turn off any power saving features until you have a stable overclock.
Edited by VanillaCena - 2/22/11 at 5:08am
post #4 of 9
What Do Your Voltages Mean? interpret bsod error codes

look there for when you get blue screen errors. The errors are specific and will help to know what they mean and what to do.

if you have watercooling then shoot for 4.3ghz. if you have a heatsink shoot for 4ghz.

click the usercp on black ocn bar and edit systeminfo and detail your hardware specs.
post #5 of 9
I have the same chip and m/board and I used cpu vcore 1.4v qpi/vit volt 1.33500v to get 4.2 but that was scary on air! Just to see if I could! But would I use that 24/7? No way!

I run at 3360 = 160x21 no hyper/thread. at the lowest voltage settings I can do!
cpu vcore1.2
qpi/vtt 1.55
mem profiled

Good luck!
post #6 of 9
Thread Starter 
Thanks for the replys! I tried the various settings posted and am currently on 1.2 VCore, 1.2 QPI/VTT and 1.5 DRAM

I still seem to be getting Errors on Prime95 "Blend" test the results.txt file shows the following;

FATAL ERROR: Rounding was 0.499302486, expected less than 0.4
Hardware failure detected, consult stress.txt file


As for system stability it does seem fine, no BSOD seems fast compared to 2.66 Stock and will run a game for hours no problem however it still annoys me that its getting errors!!

Any help would be ace!!

Cheers
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DELL UP2516D Logitech G410 Corsair RM850x NZXT Switch Matt Black 
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post #7 of 9
Quote:
Originally Posted by Jaxxxxx View Post
Thanks for the replys! I tried the various settings posted and am currently on 1.2 VCore, 1.2 QPI/VTT and 1.5 DRAM

I still seem to be getting Errors on Prime95 "Blend" test the results.txt file shows the following;

FATAL ERROR: Rounding was 0.499302486, expected less than 0.4
Hardware failure detected, consult stress.txt file


As for system stability it does seem fine, no BSOD seems fast compared to 2.66 Stock and will run a game for hours no problem however it still annoys me that its getting errors!!

Any help would be ace!!

Cheers
Up your vcore a notch or two. Usually when one thread stops that is the problem.
post #8 of 9
hello
source GIGABYTE shows how to overclock i7 920 CPU to 4GHz
adobe reader required.
post #9 of 9
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