Budget Range: $1000
System Usage: Gaming
Are you buying a monitor: No
Do you need to buy OS: No
Overclocking: No for now
SLI or Crossfire: No for now
Your Monitor Resolution:1920x1080
Why Are You Upgrading: Been using a crappy laptop that cant play any games D:
If you ever feel the need to overclock, you will have the option with this build. If you do not plan on overclocking, there's really no reason to go with the i5 3570k. The "k" on the end represents that is capable of being easily overclocked; it has an unlocked multiplier. I recommend you go ahead and grab it. It can easily get you a 20-30% boost in performance...possibly even more.
I also recommend you shop around in the case department a bit more. There's a lot more cases out there for less money. I feel you're overspending in this area. Check out the Coolermaster HAF 912; it's a pretty neat case with plenty of airflow and room for cable management.
The gigabyte motherboard you selected is a great choice. I picked out another option you could consider.
The video card you selected is also a great choice. Nice price as well. If possible grab it for the quoted $265 price. This will save you a great deal of money and you'll come away with a beefy GPU.
As for the PSU, make sure you select something that is efficient and suits your needs. You don't need a 750 watt PSU unless you plan on doing a Crossfire/SLI configuration. You won't even need a 600 watt PSU. A decent 500 watter will more than get the job done. This particular build shouldn't draw anymore than 400 watts...unless you overclock. Even then, a 500 watt PSU should be more than enough. I included a 600 watt modular PSU just to play it safe and give you some head room for overclocking and adding fans, lights, and extra storage drives.
If this build doesn't exceed your budget too much, I recommend you grab a 128gb SSD. It will significantly boost your computer's performance and overall responsiveness. It won't have an extreme affect on frame rates, but it will greatly decrease load times. I recommend something like this...
The build looks good, except for the power supply. You'll want to get a better power supply, and at this price point, Seasonic power supplies should be very attractive. I'd recommend a 750W from Seasonic. They're more efficient, and also last longer.
I agree you'd need a cooler, and for 1000 dollars, you'll want to stick in a solid state drive for quick boot times. DeusAres's build is solid, and worth considering.
If you click on the pcpartpicker link I provided, the estimated wattage is listed in the top right hand corner of the chart. It estimates 386 watts of power will be used. This is merely an estimate, but it is a fairly accurate prediction.
Not sure where you're seeing the min. requirement of 650w. The HD 7950 only consumes 200 watts of power. From personal experience, a system with a single GPU setup shouldn't draw anymore than 500 watts. The HD 7950 is among the most energy efficient GPUs ever created.
I believe the 650 watt requirement you're seeing is only a recommendation for an entire system...not a single GPU itself.