Possible Duplicate:
MemTest is returning large numbers of errors in Test 7, no matter what ram I use
I was having trouble with my Ubuntu box so I ran memtest86 and there were failures. I installed some brand new RAM, set the BIOS settings and ran memtest86 again. Still failing.
I tried both banks together and individual banks and always get loads of errors when it gets to the Random Number Sequence tests. Up to that point, everything passes.
I'm extremely doubtful that both sets of RAMs would be faulty.
So what else could cause the errors?