Will using the same brand of video card as the motherboard give any increase in performance? For example, I have an Asus Sabertooth Z77 mobo. Is there any benefit to using an Asus video card as opposed to a similarly spec'd MSI, EVGA, etc., card? I've got a Corsair H750 PSU and a 3770K @ 4.5, and a GPU is my next upgrade. I have air cooling that keeps things pretty cool. I'm wanting to upgrade to something in the GTX 650 TI Boost -- GTX 670 range. . . I really only play Diablo 3 with the occasional StarCraft 2 WoL, and will probably play Marvel Heroes when it comes out, so I don't need a monster GPU, but I would like a significant upgrade from the HD 6770 that I have now. On a separate note, should I wait to upgrade until the 7xx series comes out?
No, using the same brands won't effect performance. Diablo, SC2 and WoW don't take much to max out, my 7770 does it, a 650ti will be all you need. If you want a higher end card, the 660Ti is a pretty good performance for the price option.