Some company by the name of xgi, seem to be going the 3dfx route of multiple gpu's on a board/
[img]http://www.tomshardware.com/graphic/20031107/images/overall-view.jpg[/img]
Can read about it here, performs pretty crap though and the article is from november.
http://www.tomshardware.com/graphic/200 ... ri-04.html