AMD PCI Express to arrive in Q1 2005
 

CHIP FIRM AMD said that PCI Express for its Athlon64 family will arrive in the first quarter of next year.

That requires support from other manufacturers. The firm wouldn’t say which chipset partners were designing for it, but it’s easy to guess Nvidia won’t be backwards in coming forward.

http://www.theinquirer.net/?article=18330

I've heard production samples are available.