BSOD when running Core2 Quad Q9550 at stock 8.5 multiplier

[Robert P]

Just put together a machine using a Gigabyte EP45 DS3L mobo and a Core2 Quad 9550 2.83ghz stepping A Rev E0. Updated to latest non-beta bios for the board.

I went into the bios to try oc'ing it and noticed it was only running at 8.0 multiplier netting 2.66ghz speed so I bumped it up to 8.5 where it's supposed to be to get 2.83ghz. But as soon as I did that I started noticing Firefox crashing, getting BSOD's when shutting down or doing online gaming. When I back it off to 8.0 again, the problems stop happening.

When I do "Load Optimized Defaults" or "Load Failsafe Defaults" it still happens until I back the multiplier down to 8.0 instead of 8.5 where it's supposed to be.

Any suggestions? Is there another setting I need to be looking at to go along with the ?

Thanks for all input.

 

[beers]

Sounds weird, what voltage are you using?

 

[Robert P]

Sounds weird, what voltage are you using?

Originally it showed 1.2875 for the cpu Vcore, I changed the bios to the settings the guy lists in the first post in this thread which actually involved lowering it a bit. So far it's running okay, I've been able to do a round in Battlefield 4.

http://www.overclock.net/t/590947/q9550-ep45-ds3l-overclock-tweaking

 

[Jiniix]

First of all, put voltage at auto. If you've manually fiddled with it, that's the reason you BSOD.
Next, notice that:
CPU Clock Ratio [8x]
CPU Fine Clock Ratio [+.5]
I believe this is a form of early Intel SpeedStep. Running at 2.66GHz and 'boosting' to 2.83GHz when needed.

Please try with every voltage-option on Auto and above multiplier settings.
Then use CPU-Z and Prime95 to see if you get 2.66 or 2.83GHz.