AMD A10 6800K‏ Bottleneck

Solution
Hello,

Anything above R9-270 or GTX660Ti/GTX760 will bottleneck that APU... As a matter of fact, even an i7 cannot bottleneck an GTX780.

Cristi72

Admirable
If you already have that 780, to put to proper work you will need at least an i5 or an FX6300/FX8300. Of course, you can use whatever CPU you like, but anything below that i5/FX will make that GTX to idle a good chunk of the time. Mind you, for 1920x1080 even an GTX770 will do over 30FPS in almost any game at highest settings.
 

Cristi72

Admirable
Please have in mind also that you must pair that card with an equally good PSU; the power requirements for that card are: minimum 42 Amps on +12 V rail (504W), minimum 600 Watts total. I will not recommend anything below this one:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151096

Good brands are also XFX, EVGA, ANTEC, Super Flower, Zalman GX. Just be sure they have good efficiency (>85%) and they exceed the minimum recommandation.