SLI/CF works very well. They have around 80-90% increase of performance compared to using only one card. And I had very few bugs with sli, and when I have they are often fixed within a couple of days.fix-the-spade said:First things first, both SLI and Crossfire don't work. They consistantly deliver more bugs and lower frames rates than single cards whilst also using masses of power (high end Nvidia cards in SLI eat close to 1000W/hr!). So don't bother with it.Delta-1138 said:Feel free to cite specific cards, and their abilities when combined with specific processors or in SLI.
At the high end of single cards it's really a wash. Nvidias seem to use memory more efficiently whilst ATIs have more processing power, but both deliver comparable frame rates.
I would buy a HD6970 2GB as they're a good price and can be hugely overclocked (10-15% on the bas clock, more on some really high end ones like the MSI lightning). With more than one monitor they also perform a lot better than a HD6990 despite having half as many cores (go figure).
But really any of the 6970, Nvidia 570 or 580 ranges will work extremely well.
Below £150-ish, ATI 6850 utterly cards destroy everything else.
More details on your set up please, you are a rarity.Tubez said:SLI/CF works very well. They have around 80-90% increase of performance compared to using only one card. And I had very few bugs with sli, and when I have they are often fixed within a couple of days.
Im in no way a rarity. Just cheak pretty much every benchmark test that have been done during the latest 2-3 years.fix-the-spade said:More details on your set up please, you are a rarity.Tubez said:SLI/CF works very well. They have around 80-90% increase of performance compared to using only one card. And I had very few bugs with sli, and when I have they are often fixed within a couple of days.
On a single monitor I haven't seen any gains from SLI/CF that couldn't be made by buying the next card up the range. Any single GPU over £200 now can push 1080p and a fairly high level of AA through it without a problem.
On multi monitors both systems are crap. They deliver good average frame rates but the actual fps swings massively. It's common to see CF set ups delivering average rates close to 100fps but a minium of 0, stuttering is the most common complaint and whilst new profiles come out regularly they never seem to fix it.
It's a complete compatability lottery too, especially in DX11 games like BC2 (and one would assume BF3 as well).
My experience of the 6970 is that with some clocking you can make one of those cards produce a more stable frame rate than one 6990 or even two 6970 cards running multiple monitors.