I have a 6100/66 with 40MB of RAM (actually I own an iMac). I just added a Sonnet Crescendo 266 with 1 MB of cache and now it crashes randomly. It doesn't matter what I do... it'll freeze on anything. I've done all the normal stuff... reinstalling the system and such... but to no avail. Could it be over-heating? Am I running the correct system (either 9.0 or 9.1). If it is too hot (the Metronome stats app says 51c), what brand of fan should I buy and where should I put it?