I am now the new owner of this G4 upgrade card. My experiences with it have been different than JDW's, but also consistent with overheating. Following a pinch of curiosity, I gave the little round heatsink on the chip a little pinch and PING, off it flew, dried up grease disintegrating to dust.

I'll need to go to CVS and grab some alcohol to clean it, then I'll do it up with Ceramique 2 and we'll see how it does.