Problem not yet solved. I still get blue screens, system service exception and PFN list corrupt are the latest. I bet they are memory related. Everytime on cold boot I get errors in memtest. I tried QPI/VTT voltage 1.360, 1.340. 1.320 and 1.300. Always errors in memtest during coldboot. When it is warmed up, it doesn't seem to give errors in memtest but it isn't stable either. Now please let me copy paste the following from my thread on OCZ.
So this morning I did another memtest coldboot run, QPI/VTT voltage on 1.300V.
http://img823.imageshack.us/img823/5422/20101104085244.jpghttp://img143.imageshack.us/img143/1632/20101104104509.jpg(both screenshots from same run)
The first time I started memtest, the screen stayed blank; normal memtest screen, without any content. The 2nd time it worked, got errors quite fast as you can see. And they seem to be the same as here.
update: I just decided to restart the system, after using it for 2 hours or so. Had a BSOD when it was about to restart. System_service_exception 0x0000003b, not the first time I got that one (also with qpi/vtt voltage on 1.360v).
Ran memtest again, came up with errors. Keep in mind this time it wasn't a cold boot. Picture below.
http://img8.imageshack.us/img8/3991/20101104124038.jpgAnd another BSOD, PFN list corrupt. First my firefox crashed, then that error. Ran memtest again, QPI/VTT voltage on 1.360 this time in case it was too low, but no joy:
http://img149.imageshack.us/img149/5263/20101104130703.jpghttp://img573.imageshack.us/img573/5605/20101104130831.jpgmore updates: I also ran each module individually in every white slot (1,3,5) and gave it one pass in memtest, no errors in any slot or on any module. Though the first time I put module B in slot 3 (2nd white slot) memtest would be totally blank, same thing as I mentioned before. Then put back all the modules and also gave them one pass in memtest, no errors.
There seems to be no logic, except for coldboot memtest errors that do seem to persist and also BSOD's are still here. If you ask me, those two facts should be linked together.
Remaining QPI/VTT voltages I can try are: 1.280v 1.260v 1.240v 1.220v 1.200v and of course anything lower and higher, but I don't think we want that. I started testing at 1.360v and went down.
But what does all this tell you?