MietmaN...
I was too fast in believing i was in the clear. I crashed after a whole day of system operation without errors. Again Hard disk issues. This time no vcore or vdimm drops. Then after 15 minutes I crashed again! This makes me frown severely because i have no idea what makes a system run smoothly for more than one day and then all of the sudden making the OS crash after 15 minutes. Even my other OS on a different drive crashed. So now i changed the power saving to S3 and my agp aperture size to 64mb. The aperture size thing was set to that value when i had no crashes and i do remember changing that half an hour before the first crash. Perhaps we have some similar problems...
The OCZ makes less noise as my previous
PSU. The previous one was a Thermaltake purepower silent 480W which was far from silent and not very stable. If i crash again, i'm going to errorcheck and correct my disks again (which is my standard procedure after a crash like this) and flash to the official bios with hard L12 mod. I still have the mod. If the situation improves there may be more work for Merlin and there fore you as well.
The thing is that indeed on my system, the stability in memtest and prime are the same as you. Fully stable. And i'm out of ideas as well if this won't work.