Dead cards? Why you need dead cards? As i know most of the video cards hard to repair even a little problem.
They're pretty damn difficult to repair, yeah, but I like a challenge. When it's just something like the VRMS, they don't appear TOO hard to detach with a heat gun and the right solder tip.
Fixed a 5770 two years ago by reflowing it in the oven and replacing capacitor. Have a 290 at the moment that I bought for $40 with a blown VRM, just waiting on a few VRMs being sent from DigiKey in the US to try and replace it *fingers crossed*