Hope you work it out - I just remebered that I previously bought 2x2GB 6400 Gskill PQs when they first came out. I couldn't get them to run at even DDR800 on a P5W nor a P5K deluxe so I RMA'd them and got 4x1GB Ballistix. I also sometimes find that superpi 1.5 fails to run although I run prime95 and anything else with no problem.S ometimes it executes but fails straight away on 1MB run . Subsequent runs are normally fine.
Warning - if you do decide to try an reflash with new Asus update remeber to load optimal setting beforehand. I am very wary of using asus update as I killed my p5k deluxe with it as the BIOS flash failed to verify after erasing EEPROM but I had left the overclock setting applied - still I then got to buy the Premium after RMA so it worked out well for me. Other not so lucky! Still you dont seem to have the choice of using EZFLASH and USB stick if you want to regress so best of luck.
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