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CM2X2048-6400C5DHX bad module


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I have the 4 GB set of CM2X2048-6400C5DHX and one of the modules of RAM is dead. At first I installed both modules of RAM, the system would not POST, so I tried each module one-at-a-time. Only 1 module will post. If I put only the bad module in the system doesn't POST either. The one good module passes Memtest86+ successfully. I've tested the pair in 3 systems:


P5B Deluxe - fails

P5K Deluxe - fails

P5K Premium - fails


Do I need to RMA the set? Or just the faulty module? Thanks for the help!


Edit: The kit is the TWIN2X4096-6400C5DHX. Each stick is labeled CM2X2048-6400C5DHX.

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