depends on your CPU :D ( but since you have a 780 i guess u have a i5 or i7 so it's not a problem ) no it won't be bottlenecked why ? because their is no game out their that would push 2x780's to have their max preformance :D so what ever game your playing at 1080 you will never use the 2x780's at their max power xD don't worry bro :D everything is alright :D