BH -- the motherboard is a Formosa.
BevGG,
The reference to Cheetah is valid, it's an OEM HP part number that referred to the graphic card. That means it was specifically manufactured for HP, and has been spec'd to their cost/requirements. I did find 64 and 128 bit Cheetah's here. but again, HP spec'd a different set of outputs. I found the 'red' version here. It has the 2 ports.
Sorry this does answer all your questions, but hopefully you have been helped.