What do you base this statement on?
Whilst it is true that performance with both the GTX 660 and GTX 660Ti drops off above 1920 x 1080, surely the entire point of SLi is to run large resoultions?
Are you seriously suggesting that a GTX 660 SLi combo would not run 2560 x 1440?
It's a bad use of money when a 7950 crossfire combo for the same cash gives you a 384 bit bus which will perform far, far better at a higher resolution.
Same applies if you add AA. 660Ti performance nosedives.
It's closeish (not really THAT close) at 1080 without AA between the two cards (relatively speaking) but at higher res with AA the 660Ti becomes a very poor option.
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