What board was it in when it gave errors in memtest?
Try this, set around 1000 - 1100 CAS 5 @ 2.0v and memtest it in the maximus. Does that give errors? If not straight away, leave it testing for awhile. See if they come back while using only a low voltage. It may be damaged though......
Neither of your PSU's are bad with ripple (Thermaltake is <100mv) so I'm leaning towards the board. However I had a P5B a year ago, and I ran my D9's in it at 2.13v (real) for 8 months without any issues.
Maximuses (Maximii?) have been known to kill D9, not sure what theyre like personally never owned one.
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