I have the same board, and I am running two of these modules:
TwinMOS PC2700 DDR-DIMM 256MB CL2 32M*8/8chip, 184-P (for DDR-PC333MHz)
Sometimes, that creepy voice says "memory test failed", but it boots up just fine, and the computer is behaving stable, I leave it on for days running the UD agent. No problems whatsoever.

I hope for a new BIOS version soon, hopefully this could be fixed. On the other hand, I am not getting any error message on screen, only with voice, so maybe the voice error reporting is buggy?