2x 550
Some similar thread about it. 2x GTX (Palit) 550 Ti or 1x GTX 560 Ti (MSI Twin Frozr II OC 1GB)
Nope.
heard it's harder with the drivers, they get all hot...
isnt a twin frozr enough on a 20 inch 1900x1300 ?
Nope.
My first thoughts are that SLI of the 550 may be faster, I know that SLI of a 560 is faster than a 580, but with the 550 you're going to have to do some research.
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HAVING VIRTUAL DETOX
Hmm it might be me, but I would stick to the 560, I think that by habing 2 550 their power cannot combine, they would work separately liek two GPUs. (same case with a i7 3.0Ghz for example, it runs 3.0 ghz each core not all cores altoghether like 8x3.0Ghz = 24 gHz.) So I think a 560 MSI OC would get you a better performance in the end. But this is just me, if anyone out there who knows this better may actually give you some more reliable advice. Or just do as Dave said and get Google and research on your own.