Ah mate,
I know for sure that with the A8V the PDP-XBLK grossly underperforms. I hope you have better luck. I would suggest the following:-
2.5-3-3-8-1T (first at 2.6 V and then at 2.7V). Try bumping the FSB to 240MHz and run memtest for 15 min. Then bump it upto 250MHz and run memtest for about 14 hrs, disregarding any errors. Shutdown and run the test you errored on the next day.
I'll lead you on once you do this. TCCD performs best with low voltage, so 2.6 may be better than 2.7. You will have to test that out.
Next try 3-4-4-8-1T and repeate this procedure.
Good Luck!
S-N