Running 2 GPUs

So I currently have a Gigabyte gx 770 windforce x3 4gb vram. I have a gtx 560 2gb thats superclocked. I was wondering if my psu would run these both in non sli (obviously)

Rest of my build

1337 mhz ram. 8gb
p8z77-v lk
1 SSD x1
1tb HDD 7200rpm.  x1

and a 600 watt psu (thermaltake tr2)

also I don't know if it matters but i have an external HDD that's 5400 rpm.



I also have 3 case fans. 

you should have enough power.