E8400 doesn't go to 3.9Ghz anymore, after 5 weeks

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23 Aug 2005
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A month ago I RMA'd my mobo after my PC became unstable. I did some tests, but mainly one test which was try to reinstall Win7, which failed with BSOD the 2nd time around. The place I got it from confirmed that issue too. Now I've got a new mobo, but the problem was still there. So I though it was CPU at fault and tried to reinstall XP this time.. but, no BSOD..! clocked back to 3.9Ghz and PC hung, backed off to 3.6Ghz and fine so far (30mins blend, 2 L4D sessions. Going to do Othros and memtesting over next couple of nights).

BIOS settings were:
FSB Freq: 434
FSB Strap: 333
CPUv: 1.15 (stock)
GTL Ref: Auto (coz I've no idea what it should be and neither does anyone else AFAIK)
PLLv: 1.52
FSB Termination volt: 1.22 (now at 1.12, one notch above lowest - could have been that?)
DRAMv: 2.04
NBv: 1.3
Steedstep was enabled, not while I was experiencing problem nor at the moment while testing again.

I read that P5Q range of mobos set things to auto if set to the lowest setting (!) hence setting one notch above lowest. Also this time round, using 5:6 divider as these mobos don't do well on 1:1.

Max load temp got to 66C max - this is 'warm' but not too hot?
IntelBurnTest got it to 76C a few times while testing initially, but only for 10 mins at a time - could this have damaged it?

I'm not too fussed about 3.6 over 3.9, I can't RMA the CPU because there's no fault at stock speeds (again, didn't buy from OCUK, due to not having everything I wanted at the time)

I just wanna know if I did something wrong and make sure in a few weeks time, 3.6 doesn't become unstable! I'm currently thinking I should get a better heatsink..
 
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VID is 1.15v. Yeah I guess it could be nothing is wrong! heh. I'm just using lower settings this time round, so more likely to crash at lower volts. The only thing I lowered is FSB Termination volt. Maybe all the problems were just XP got corrupted (no idea why, tested for everything) and Win7 being weird and throwing me off testing..

DRAM is rated up to 2.1v, but another great feature of these mobos is they overvolt the ram by an average of 0.08v :)
 
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What are your thoughts on 66C load temp? Do I need a better heatsink? Strangely it's 66C max load even at 3.6ghz, which was what I got at 3.9ghz too.. 4ghz was unstable in games and was 2c more iirc.

Yeah my PLL is +0.02, i updated that post while you posted yours :) I know about the +1 notch thing. Pretty poor from asus imo.
 
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