Is it possible to crossfire these cards?

No, I am almost 100 percent sure it has to be the same card. Does not have to exactly the same in layout and such but it would need to be another 4650 or another 4770 in order to crossfire.

you need 2 similar cards to cross fire exact match is only with sli .those cards differ too much

Wow   okay so if I crossfire with twin HD 4770 the reviews in tom's hardware says it rivals performance of cards costing much more.

now what will I need to crossfire with my M4A78-E mobo?

you can crossfire a 4770 with a 4750/4770/4830/4850

be sure you have a good power supply for cossfire

I have an ultra 650w PSU. Good enough?

yeah should be ok for 4850 crossfire and lower

Would you be concerned if the twin HD4770's were different brand names? I don't know I feel as if pairing means same brands too.........

ty

Since this is a current post...

I have the following card

http://www.amazon.com/MSI-R4850-2D512-OC-256-bit-CrossF...

However I'm looking at getting..

http://www.newegg.com/Product/Product.aspx?Item=N82E168...


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?

actually crossfire scales the 2 cards to a point but core speed is more important then memory capacity/speed