I would think a bad motherboard would be more likely to damage chips than a bad chip would be to damage a motherboard.
So I'd take a known good motherboard, and place the questionable chips in him, one at a time.
If you find a bad chip, it's most likely just the chip, but it could be something on the motherboard burning out the chip.
I don't know that I've seen that tho.. Mostly I've just seen chips needing to be replaced.
desiv