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My main PC is an ASUS P5E64 WS Professional. After ensuring the mobo supports DDR3 1333 I went ahead and bought 4 x 2GB Transcend DDR3-1333 DIMMs today. I poped them in and the mobo fails to post - no beep, no signal to video etc.. A blue LED labelled DIAG DRAM lights up on the mobo. I checked to ensure they're all seated properly etc and retried. No cigar (or smoke ). Put the 2 x 1GB DDR3 1066 sticks back in and it posts. I noticed tonight that Transcend isn't on the Qualified Vendor List for this mobo, but damnit, dram is dram, not so? What do you guys think - is the likely a compatibility issue or could the DIMMs be faulty?