k so i have a NVIDIA GeForce 7900 GS and i want to upgrade it... i was lookin at a Radeon 4890 1gb or a 5770 1 gb ... i have around 200 bucks to spend on a card and wondering which is better for gaming...if there is another card that you think is better for that price range then thatd be cool too, i dont quite understand the thing with the 128 bit and the 256 bit.. any help would be sick....
128 bits accesses data 16 bytes at a time
256 bits accesses the data 32 bytes at a time.
so if you had to get 1kb of data the 256bit engine would only require 4 fetches instead of the 8 for the 128bit engine.
On top of this you need to factor in DDR type and speed.
As for recommendation, I'd go with a gtx460 myself. The 768mb version is about equivalent to the 5770 and the 1gb version is about equivalent to the gtx465.