If you have a P45 motherboard, the HD 4870 X2 will win because the other combination will run at 8x+8x and suffer from bottlenecks. On an X48 motherboard the results are very close.
ahh but the question is, will it get bottlenecked by x8x8?
much you have to learn, master yoda.
:lol: sorry couldnt resist...
LOL , Id go HD 4800 X2 just beacuse in the long run its cheaper you only use one slot, etc etc, but if you have a x38 or x48, or x58 and even a 790FX its worth to get 2 HD 4800 instead of the X2.
ahh but the question is, will it get bottlenecked by x8x8?
much you have to learn, master yoda.
:lol: sorry couldnt resist...
Not sure I understand the question. A single HD 4870 X2 would occupy a single slot, and P45 motherboards do not drop to 8x8x when a single slot is occupied. That HD 4870 X2 would have the full 16x bandwidth available to it.