Anyone With Ep45 Oc'ing Experience?

[Randxalthor]

Hi all : ) New poster, long-time lurker. This place is such a great community!

 

I've been pushing my trusty Q6600 lately and it's a brave little chip. When I run Prime95, however, it black-screen instant reboots to the POST screen after a while.

This happens whether the temp is 50c or 65c and this is the only way it fails, so could it be some other part of the motherboard thermally throttling?

Maybe the PSU is conking out?(the power pulled is way less than it's rated for)

Here are the specs for the OC so far:

 

CPU: Q6600 G0, 1.3 VID

3.51 GHz @ 390 x 9

1.424v vCore idle and load, vDroop prevention enabled.

1.4v VTT (vcore never droops below)

1.3v MCH vcore

2.00D(tried B, too) memory multiplier, passed memtest no problem

6-5-5-15 2T timings

1.8v mem

• reference voltage: gonna have to check. I'll edit the post as soon as I get back to the BIOS.

• all the normal settings for a Gigabyte board when overclocking are set. no C1E, throttling, standard performance boost, etc.

 

the setup:

OS: Windows XP SP3

case: Antec 900

PSU: OCZ GameXstream 600W

cooler: Xigmatek S-1283 w/ AS5 and bracket(no pushpins)

mobo: Gigabyte EP45-UD3R

GPU: nVidia 8800 GTS 320mb

RAM: OCZ SLI Ready DDR2 PC-6400 rated 5-4-4-12, safe up to 2.1 under warranty

 

I'm stumped! I've tried playing with the reference voltages, the VTT is as close to vcore as I dare go, and pushing the core voltage doesn't help a bit.

I tested the FSB up to nearly 500MHz at 6x multiplier and it was rock solid at 450x8 for a long time before I got the OC itch again recently.

At the current voltage, the system will boot plenty higher than what it's at now.

~28-30c idle(~26-28 ambient) and never above 65 on the hottest core even during small FFT stress.

The PSU isn't a great one, and speedfan and PC Wizard freaked me out by reporting < 2v on the +12v rail, but HW Monitor reports ~12.6v, so I'm guessing that it's fine?

 

If anyone has any other suggestions on what may be the problem, I would greatly appreciate the help.

If you need me to post more information or try something, I'll check in often. Thanks! : )

 

,Randxalthor

 

 

edit: subtitle.