Gah.. I previously had a very stable 3.8GHz o/c on a C0 stepping i7-920 at CPU VCore of 1.35V and CPU VTT of +225mV on the SZ2R BIOS. Now I've got the 44 BIOS and I am still hitting 101 BSOD's at a CPU VCore of 1.4V and CPU VTT of +250mV with everything else the same.. this is insane..  RAM is running at stock spec only... 

I recently moved to Windows7 64-bit (from Vista64), and more recently moved to a SSD for the boot drive, but that should not make this much difference, if any.. I just can't get a stable clock anywhere above 3.4-3.5GHz...  wondering if I should flash back to SZ2R again.

Yeah I saw that thanks, and had it turned off (also have 'normal' turbo disabled). I'm not sure what the problem is.. seems particularly since I added the SSD a few weeks ago I've been having issues.

Curse Newegg for sending me a C0 instead of D0 stepping last year. .

I guess I could continue cranking up the CPU VCore voltage into the 1.4 range, but then I'll start having additional heat issues to contend with.. also noting my VReg temps becoming a concern at these higher voltages.. *sigh*  

For some reason I have to give more voltage to the CPU to get a stable clock with this BIOS. I'm on air cooling so I rather no have to increase the temp so I'm going back to SZ2Z.

flashed booted ram stuck at 1066 from 1600, rebooted enabled XMP still 1066, rebooted loaded defaults set everything manually disabled "turbo performance" saved booted still 1066.....

EDIT:
Went back in took it off auto left XMP enabled manually set 2:12 ratio (1600) all works now

You've never flashed your bios before have you? The flash routine is more than a couple of flashes from the cd player. If all you got was a couple of flashes then it bootedc on through to windows then you didn't burn the iso file properly. Or did you burn the bin file instead?

i'm having problems with my dimms. I have had them overclocked (technically) to 1600 MHz and 7-8-7-20 for the last year in my board with various bios versions (dominator rated xmp 1600 8-8-8-24) After flashing to this bios, though, the memory will run at 1600 but only one stick is recognized. So I was lagging like crazy and had no idea what was up until I saw that I was using 99% of my ram. not good. Usually I use no more than 60% with the full 6GB, but I only have 2 now. Any ideas? I've been messing around and after I cleared cmos it saw the full 6GB. I'll be tinkering more and post whats up.

on an unrelated note my usb G15 keyboard used to work fine through the bios and now I have to break out my PS2 keyboard. Strange because it works at first to call up setup or the boot drive menu but doesn't work after or to tell windows what mode to boot in after a hard shut down. It's running through a usb hub on my monitor but that has never been an issue. ?



EDIT:
Sorry guys, should have read the whole thread. Someone else had the same issue. Solution: the OC presets from old bios versions arent quite compatible with this new bios version. Clear CMOS and then reset everything manually. And read the whole post before you post :)


USB keyboard issue still eludes me though. It works to call up a menu at first but doesnt work at all after that. If this is just me if might be because it's running though a hub. No idea. PS2 keyboard is always at hand at any rate.

and not forgetting that the base VTT is now 1.2V, not 1.1V anymore

 
when did this change occur?
 
so +175 vtt in this bios = +275 vtt in SZ2X?
 
WOW! If this is true I cannot believe EVGA would make a change like this and not document it in the changelog!  I was adding 100 more mv to the VTT and not even knowing that it is happening?? Come on now!  This is unacceptable, especially since how criticical this voltage is to stability.