What if there was an adapter that made a regular motherboard into a graphics card. Plugging into a pci or agp slot sort of like a bridge. With a few minor adjustments to the other motherboard such as a memory less vga pci card that just displays the finished product of the motherboard. And maybe a 16mb flash drive that holds only the initialization program and plugs into ide slot. A new case would be neede to hold the two power supplies and motherboards required. This thing would be no bigger than some peoples normal giant rigs.

That would be indeed a very expensive and slow Video Subsystem.

All Video manufacturers have extremely powerful Emulators (complete Clusters) to test new designs before they are put in silicon.

Despite being more powerful than 25 High-End PC's, they're still very slow, useful only for fundamental testing and bug-tracing.

In terms of GigaFlops, modern GPU's achieve about 10 to 25 times the performance of CPU's.

(fastest x86 get to about 10-15 GFlops peak, a 1900XT GPU achieves upto 180 GFlops peak with its massive parallelism)

CPU's can do everything, but slow. GPU's are limited in feature set, but perform it extremely fast. Fully specialized circuits (DSP's for example) perform their tasks even much faster...