Just wanted to follow up for all of those that wanted to "chalk it up to your system" as killing the 2 HD 4870s that died.
I've had the PNY GTX 260 overclocked to 756/1566/1242 for the last month, not a single problem. I've had this working longer than either HD4870 lasted and best of all the same hardware. So it was never a problem with my hardware just crap GPUs. Nvidia FTW this round for reliability.
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