This would be the ideal method, if an RMA is not possible.
However, most people, without knowledge of the solder used, it's re-flow point, having never done this before, and lacking the majority of these materials, would likely have about the same chance of success with the much simpler oven method.
It may not even be the GPU itself causing the issue because the RAMDAC/display controller is on a separate NVIO die on the GT200 series.
AFAIK artifacting is usually the GPU core. RAMDAC and memory issues usually come across with weird colors or ASCII characters in the wrong places, or repeating pattern artifacting
Edited by Pyroball - 8/18/11 at 4:03pm