I personally would SLI it. You can mix any brand of card, as long as the memory of the card is the same. Since they're both 1280MB, you're good to go! Your card at a higher frequency will clock down to match the lower speed @ 732MHz if you SLI. There will be no real world difference from 780MHz to 732MHz if you were wondering that also. You could also slightly overclock the EVGA one to 780MHz if you really wanted with a program like MSI Afterburner, or EVGA Precision, then you would match your factory overclocked speeds on your current card.
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ASUS VE278Q 27" LED / DAS Professional Model S Cherry MX Blue Mechanical / Logitech G500 - QcK Mass / Corsair Veng 2000 / Windows 7 Ultimate 64bit
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