NoasArcAngel
Wise Old Owl
Lets get some facts right
for a 680 paired with i7 16gb ram 250gb hdd ssd dvd and rest
will gulp about 370 watt. so Recommeded PSU will be a 650W which will leave some head room for OCing.
For a 680x2 it will be somewhere around 600 Watts
so a 1000 W psu is recommended
All figures under LOAD (max load as the game is metro 2033)
Source: Anandtech reviews
This is what i am suggesting to op plus he will be running a hdd and some case fans so 700w is pretty good then
And max tdf of gtx is 195w board power is around 230w have suggested op to go in for a 1000w psu in case of sli in future