The Apple dual 500 needs to be modded to fit by moving a coil on the daughtercard, and also two spacers to make contact between the cpu die and the cube heatsink. The sonnet dual 500 just needs the spacers no coil moving needed. you can find all kinds of info and pictures on http://www.cubeowner.com and there was a writeup on accelerate your mac <http://www.xlr8yourmac.com/systems/cube/dual_g4_cube/ sonnet_duet_cube/dual_g4_cube_Sonnet.html> On Dec 4, 2006, at 1:13 AM, Andrew wrote: > I'd like to know more about this upgrade, is it a OEM processor > that happens to fit the cube or is it an aftermarket upgrade?