himy system:Asus R.O.G. Rampage IV Extreme, X79, LGA2011>> 27" Display with 2560 x 1440 resolutionAsus GTX560 DC2 TOP 925MHz PCI E 2today ordered a new card:Asus GTX660Ti DC2 TOP 1137MHz PCI E 3should i connect them with SLI?ist the single GTX 660 f...