What? Unless you wanted to cross fire 2 ATI cards it doesn't matter.
This is common knowledge, all you need is a pci express x16 slot and adequate power, it can be an nvidia, intel or amd chipset.
how r u sure
Because the PCIe-x16 slot is standardized, and backwards compatible?
its gonna be fine, you just wont get crossfire. by the way, i recommend that you read the amd 4890 article here on tomshardware because the 4890 only gets like a 10% gain vs the 4870 1gb edition. price/performance, the 4870 1 gb is wins.. 4890 isnt worth that 250 dollar price tag IMHO 30 dollars more and you can get the flagship single card solution by nvidia. the GTX 280 (well actually the fastest single card solution is the GTX285) not counting dual GPUs of course