Since this is a current post...
I have the following card http://www.amazon.com/MSI-R4850-2D512-OC-256-bit-CrossFire-Supported/dp/B001SIG5UM
However I'm looking at getting..http://www.newegg.com/Product/Product.aspx?Item=N82E16814127435&Tpk=msi%20HD%204850
So I know I should be fine Cross-Firing these... however... from what I know about Cross-Fire..
"You don't need to buy a pair of identical cards for CrossFire motherboards.... However, if the boards aren't identical in performance, the faster board will be throttled back dynamically in order to maintain synchronization."
So will that second card not really even utilize the 1GB ram?
Would I be better off just purchasing the identical card from Amazon?