Hi there, I recently put a post asking about which card I should buy. However the r9 280x was suggested, but I found out that my PSU will not run it, so now I'm tossing it up between the GTX 770 vs the GTX 960.
The 280x and 770 require around 600 watts while the 960 only requires around 450 watts. From your other thread, you have a 700 watt power supply, so it seems you are fine. However, what exact model of power supply do you have?