I will OC lightly on the GPU and maybe OC the i7 to 3.8Ghz. Is 750W enough for this? I dont want to waste money for extra wattage that wont be used
I'd go 1000W, your TDP is going to be around 700-750W
I think you'd be OK, look at this video: http://www.youtube.com/watch?v=LiWThqgFfI4
But if you want to be the safest, you could get a 1000w.
What would happen when you exceed the limit of your PSU? DOes your PSU blew up?
Lol. Don't worry it won't blow up! It would fail and probably won't supply power to certain parts.
go for 850w minimum if you are oc'ing.
To be safe, and also give you more headroom, i would have to say go for an 850w if you can. I think that the 750W is a bit of a close call.