[tbob22]

I can assure you that it does work. Not sure about 340f though.

I baked a Nvidia GTX470 at 390f for 10 minutes and it eliminated the artifacts/crashing and has been working fine for months.

It probably won't work forever, but it is at least a temporary fix.

[lvs]

I did an oven reflow on an RRoD Xbox motherboard years ago. Worked like a charm. I was a little worried about bursting the caps, but a little insulation and aluminum foil protection apparently kept them cool enough. Lasted for about a year.