The Intel D850GB has the words "Intel Desktop Board" imprinted on the motherboard, but it's pretty far from being a general user desktop motherboard. It sports 4 RAMBUS 600/800 slots and what looks to be a non-standard connector for power button and LEDs (but most cases could be rigged to fit). This motherboard is a single CPU Socket 423 motherboard.
The manual can be found: http://www.intel.com/support/motherboards/desktop/d850gb/sb/cs-013247.htm
If anyone has further questions about the motherboard please email me directly and I'll investigate further.
Cheers,
Charles