Only happens after several hours. Hardware or driver problem?
Overheating, lack of adequate amperage at 12 volts, damaged system RAM, or damaged card.
Thanks for your input. Definitely not overheating, cool to the touch. Power - conceivable, but why only failing after hours of normal ops? Damaged system RAM - diagnostics on system run fine, but I've seen it before where diagnostics don't catch everything. Bad card - that is the current theory. AMD rep told me that is most likely and to get card replaced, which I am working on. Stay tuned.
Received replacement card from Amazon (no hassle) and it has been running now for 48 hours without failure. Looks like problem solved (knocking on wood!)
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