so im getting a new gpu but i want to know, can i overclock a 2gb GTX 660 to be at least on par with a 4gb 760 on a single 1080p monitor? i ask because the 660 can be had almost 100 bucks less than the 760 and when i overclocked my 460 i saw a roughly 20 fps increase in Crysis 3. And later on when i SLI one of these cards, how will they stack up? i heard that if you SLI you still have as much memory as one card, so would i have 8gb sling the 4gb? and will i really see a difference in 2gb vs 4gb on a single 1080p monitor? anyway, thanks for any help i get. sorry for this being a cluster of questions as i'm about to go to bed 
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