Advise needed! Lock ups fix?

I pass prime95 after 12h blend tests, temps seems alright, but already experienced two lock ups in last two days whle playing multimedia...

EVGA 790i FTW
Q9400 (2.66) 3.6GHz 450x8 1.33V-Idle 1.30V-Load
Corsair 4GB DDR3 (1600) 1800MHz 1.85V 9-9-9-24
XFX HD5970 2GB
PSU 650W
Win7 Ultimate x64

FSB - 1.47V
SPP - 1.42V
MPC - 1.60V
PLL - 1.5V

GTLVREF 0 - -50mv
GTLVREF 1 - -50mv
GTLVREF 2 - +0mv
GTLVREF 3 - +0mv

Virtualization - enabled

Temps: Idle Load
core 1 32C 50C
core 2 32C 50C
core 3 46C 48C
core 4 46C 48C

today tried to wake up my pc from hibernation mode, fan started to work but there was no signal sent to display!? after restart message appeared, that i should change freguency of cpu or ram!!

any idea?

Hi to the forum

When it locks up, does it crash as in BSOD or does everything just freeze on the screen and you have to restart manually ?

If its just freezing then its a RAM issue, see this thread here: http://www.overclockers.com/forums/showthread.php?t=644568

There are so many issues related to this on the web that it is really hard to pin it down.

It seems there are video driver issues as well as Windows 7 issues. I have also noticed a lot of related RAM issues as well.

My sleep mode works well most of the time, but I still occasionally get a start up problem just like yours. Does this happen when you turn down your OC? You might try running a Memtest just to be sure its not your RAMs. Then turn back your OC for a couple of days to see if it continues.

Raised Vcore and problem with hibernation seems gone...

will see if it will help with freezing!?

Edit:

no it didn't

I'd lean towards your ram, dial it back a few mhz and see if it settles down

thanks i will do that