Trade 560ti asus dc2 sli for gtx580

If it doesnt cost you an arm and a leg, yes.

I have those cards too. I wouldn't trade them for a single 580. From what I have read they equal or out perform a single 580 at 1080p resolutions so the only benefit would be not having to mess with sli's quirks. For me I am holding off until Nvidia's GTX 6xx series. Rumor is saying the GTX 660 should be around a GTX 580 performance wise. My plan is to go with a single GTX 670 (or what ever replaces the 570 spot) and call it a day.

well it not quite trade one and sell other card (uk)

as he wants £120 and one 560ti (UK £)

What I ment is that your 2 GTX 560ti will out perform a single GTX 580 at 1080p res. So it is probably more of a downgrade to get the 580. You should wait until the 600 series and sell your 560tis and upgrade then

yer but then will the cards be worth anything.    

I'd say no. 560Ti will significantly outperform a single 580 in most situations. People talk about SLI quirks but in my experience, these are mostly a thing of the past. There are some situations in which a 580 will outperform 2*560Ti, but these are few and far between.

2 560s in SLI offer no upgrade path. A single 580 which performs just as well maybe a bit under does.