ATI releases their multi VPU solution on the world. Viper's Lair look at the tech from a hardware perspective:

So, does ATI bring anything to the table that we have not seen already from NVIDIA? In some ways, they work the same; two matching series of cards, and a supporting motherboard. Unlike NVIDIA, gaming profiles aren't required for Crossfire. According to ATI, with the correct hardware, Crossfire is something that is enabled as soon as your PC is put together. Their approach is driver independent, so in theory, older games as well as newer games should work in Crossfire mode as soon as you fire them up.



Link: Viper's Lair