Anybody know if a GTX 770 can be powered by a GS700? Does it have enough amps on the 12V rail?
I'm no expert, but seeing as how nobody else has come to your aid...
Without knowing any more about your rig's power consumption... CPU, is it OC, how many drives do you have, are you planning on OC the 770, how many fans, how many LEDs, all of your USB devices, any other PCI devices?
I would say that a GS700 would be fine.
List of specs would help. I would say it is more then enough juice for your graphics card
Case Fans: Corsair AF120 x3 and Corsair SP120 x2 and the Xigmatek LED fan included with the Night Hawk
CPU: Intel Core i5 4670k
CPU Cooler: Xigmatek Dark Knight II Night Hawk Edition
GPU: I want to get a GTX 770.
Keyboard: Razer Blackwidow Tournament Edition
HDD: Western Digital Caviar Black 1TB
Motherboard: Gigabyte Z87N-Wifi
Mouse: ASUS GX810
Optical Drive: ASUS DVD Drive
RAM: Corsair Vengeance Pro 8gb 2x4
SSD: Intel 520 Cherryville 120GB
Do you already have the GS700? You can get a much better PSU for the money.
You're fine with the GS700... if you already have it, go ahead and add on. The Corsair HX flavors are better quality for the money though. Maybe even spring for a 750 just to be safe if you don't have a power supply yet.
This guy on another forum, whom a trust very much with power supplies, said a 750W can run a rig with SLI'd 770s. You'll be fine. As Brent said, Corsair's HX series are better quality.