Ok, here's the deal. I have an Asus A7N8X board. It's a great board, hasnt done me wrong yet. I got 2 sticks of 256 DDR2700 Corsair ram running at dual ddr.
I just ordered another stick of Corsair ram, cept this one is 512 DDR3200. I plugged it in and everything came up fine, the system recognized the memory and everything. I walked away from the computer to let it boot up, and when i got back it was froze.
I restarted it and it said "System Failed Memory Test". So i took the 512 out, and it worked fine. Then i reseeding and switched the memory sticks around and everything to no avail. I even just put the stick of 512 in there by itself and i still get the message. I mean my computer isnt screwed up, it works just like it did before. But i dont know if I should RMA this memory, or if there is something Im not trying.