I myself have a 8800 GTS 640 and I have a 1680 x 1050 screen, so understand that I hold no prejudice when I say that either card should do fine. One card may be better in one game, and the other will be better in a different game. The early drivers with the 2900 were pretty bad, but they have been straightened out and the card is now a good, mid-range card in my opinion. I'd mainly shop with price being the main consideration, though if you have an AMD cpu, the 2900 may perform slightly better than the 8800 GTS, as the release notes with the 8800 specify particular problems with AMD K7 and K8 chips.
so i have the hiper type m 580 watt psu. will that be enough to power the 2900 xt as i need a 6 pin and an 8 pin to power it. http://www.ebuyer.com/UK/product/109552 thats the power supply i have. i have opened up my pc and i see that i have a 8 pin connect and the usual 6 pin connector.
Well they are retarded, because the DX10 version actually runs a tad faster than the DX9 one.
On topic: Get whichever is cheaper, because they are pretty much on par.
I think my response may have been a little muddy but IMO it was on topic. Anyone who says they want to play Lost Planet smoothly is most likely referring to DX 10 in some way and I was just passing along something I had read.
If the OP wants to play DX10 games "smoothly" he/she may want to consider waiting for the next gen of cards. I'll try to be more clear next time.
Here's the quote by Norman Chan:
"With Windows Vista and a DX 10 video card, I gazed in wonder at the amazing shadows cast by objects in-game even as my monitor screen turned into a slideshow"
That guy is an idiot, he probably set shadows to high, but in Lost Planet the difference between high and medium shadows is non-existant (Except for a performance hit). The game is very poorly optimized, we can all agree on that, but I urge you play Lost Planet on your own and see it for yourself, it's not about DX9 or DX10, it's just poor optimization. But Lost Planet is one of those few games where I say that you don't need constant 50fps+ to enjoy it. (Mind you I almost never say that!)
Also, now that Bioshock has been released and plays just as smoothly under DX9 as it does under DX10 with improved effects, I think I can say that it is not "necessary" to wait for next gen cards to play DX10, however what really will be necessary is not to go below the 3 top cards (GTS 320/640, GTX, and 2900XT).
I also had this question and am tracking back in the forums looking for which card to buy. The only thing that seems to go for the x2900xt is that it should have more longevity because the drivers are still not really optimized - whereas the 8800gts has mature drivers.
Does anyone know have any benchmarks comparing an x2900xt with catalyst 7.8 to the 8800gts cards? i've looked very hard and haven't found anything...it would be pertinent to the topic of this thread.