If the Sonnet software does anything at all, it will be to enable the cache (or set the appropriate backside cache bus speed). So I'd experiment with it and with out it to see if it is really necessary. The cards (I have two: http://www.ppcmla.com/forums/viewtopic.php?t=242) bypass the motherboard's CPU multiplier jumpers and use an on-board system to determine the CPU speed from the bus speed of the host Mac.

Good find. And HWMNBN does seem to have a good supply of processors. I'm thinking he must be some sort of "recycler" of old computer equipment.

Peace,
Drew
_________________
Power to the PowerPC!