I've recently recieved a PowerForce G3 cpu card (i.e. old style, pre-g3 pci powermac) from powerloigx as a replacement to a powerlogix powerboost 200mhz 604e card that died under warranty. The heatsink the powerforce g3 came with was, much to my dissapointment, rather small. Basically, it only dissapates enough heat for the card to run at its rated speed of 220mhz; any higher and it overheats (until I put in a fan; see end of message).
FYI, this is a PowerMac 8500, originally with a 150mhz 604 cpu. It has run at its stock bus speed of 50mhz for eternity, 1st with the original 150mhz 604 and later with the powerboost 200mhz 604e until that cpu died.
What I'd like to know is, is there any body that sells the huge heatsinks that powerlogix uses on their higher speed cpu cards (not zif cpus, but old style cpu cards)? Also, I looked at apple's heatsinks, but it doesn't line up with where the screws go in and where the clips attach to cpu card.
P.S. Why don't I install a fan, you might ask? I already did: I put in a 12v, .13 amp, 4 inch fan and connected it to the 5v wire on one of the power connectors inside the mac and its still too loud. Anything more powerful would almost certainly be waaaay too loud for me. I figure a massive heatsink will be more than enough.