How did I kill them? They are virtually the most delicate PC components I've ever encountered.
The VRMs cannot handle the power that can be drawn with even a modest overvolt/OC under heavy use.
First card was a Sapphire with stock cooling. I ran it at 900/1200 with 1.15v, it lasted three weeks then started to artifact in everything no matter the voltage or speed (even well below stock). Second card was an ASUS (which advertises overvolting/ocing right on the box). It got pretty warm past 1.15v so I replaced the cooling and dropped GPU temps 20C and VRM temps 10C. Ran that one at 1.25v, 950/1250, and it started to rapidly degrade after a week of use. When I sent it back it was not stable at stock clocks/volts.
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