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Previously stable overclock now unstable

post #1 of 3
Thread Starter 
My system was running fine @ 4.2Ghz (3600Mhz QPI Link) but recently i'm getting BSODs in prime95 Small FFTs torture test. Voltages are:

Vcore: v1.325 in bios 1.29 in Windows
QPI/VTT: v1.335
CPU PLL: Normal
QPI/VTT Normal
Dram: v1.65 (1600Mhz 8-8-8-24)

I'm getting 0xFE, 0xDE BSODs.
Temps are 70 to 75C.

EDIT: Changing QPI Frequency to Slow Mode seems to be fixed the stability issue. I'm no longer getting BSODs but slow mode is not for suitable for every day usage . Another thing, my CPU temps are oddly low in Slow Mode.At 3.8Ghz QPI Link they were up to 75C, now maximum i can see is 58.

EDIT2: So i'm going to go ahead and bump the QPI/VTT voltage to 1.375 and set the QPI Frequency to (36x) 3600Mhz again. Hoping that QPI/VTT voltage is responsible from the QPI frequency.
Edited by Nautilus - 1/26/11 at 1:14am
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BACI DESTROYER
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post #2 of 3
have you tried loosing the mem timings,
if the bsod has a alpha numerical (eg 00000001A) result it is a memory failure.
if it is just numbers (eg 0000000124) then it is a voltage/qpi frequency failure.
run mem test from bios so you get all memory. and check for faults
not win mem test go get real memtester and mount to USB
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NVIDIA GeForce GTX 480 Team Group Inc. Team Group Inc. Team Group Inc. 
Hard DriveHard DriveHard DriveCooling
Corsair F120 WD Cavier Green WD Cavier Green Heatkiller GPU 
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Acer GD245HD Corsair 1200 HafX Asus Xonar essence STX 
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post #3 of 3
actually if mem is failing as tufftarts suggested ( i agree) try increasing ich voltage to 1.24v and ioh to 1.24 as well also usually wit 1600 ram you need a qpi of 1.35 minimum ( i run 1.41v ) if you like, I can post my voltages to give you an idea of what you may need ( stressing may as each chip is different and I got lucky with this chip)
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