I selected a 750w because i was going to maybe crossfire them. But if im not going to crossfire what size do i need? Basically can i go with a smaller one to save money?
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($169.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($24.99 @ Newegg)
Motherboard: Asus P8Z77-V LK ATX LGA1155 Motherboard ($124.99 @ SuperBiiz)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory ($49.99 @ Newegg)
Storage: Kingston HyperX 3K 120GB 2.5" Solid State Disk ($104.99 @ Newegg)
Video Card: Sapphire Radeon HD 7970 3GB Video Card ($369.99 @ Newegg)
Power Supply: XFX ProSeries 750W 80 PLUS Silver Certified ATX12V / EPS12V Power Supply
Monitor: Asus VS239H-P 23.0" Monitor ($174.99 @ Best Buy)
Total: $1059.93
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-01-09 16:22 EST-0500)
You can prbably use as low as 550watts but to be on the safe side I would use a 600 - 650 watt PSU.
You can easily jump down to a 660W 80+ Gold with that setup, and still be able to overclock the heck out of the 3570K. But if you're getting a second HD7970, you might want to step up to at least a 900W unit.
Just to add to the fellas above, it will pull close to 400watts with a OC 3960x(far hungrier cpu) so in a pinch you could get away with a quality 550watt. A XFX 650 is definitely a better option, i believe the prices for the 550 and 650 are fairly close so definitely the 650.
Here is a link to the 7970+3960x power consumption: http://www.anandtech.com/show/5261/amd-radeon-hd-7970-review/27
Cool guys thanks. I found a seasonic 650w gold certified.
SeaSonic X-650? Hard to find anything better :)
if it says Seasonic and its Gold certified, you've got my vote for sure... they are "THE GOLDEN STANDARD" when it comes to PSUs
600 w would do fine but just in case get a 660w or higher