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How much power

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February 4, 2013 4:52:58 PM

Hi guys some info needed please, or do i need to upgrade to more power. This is all i am adding to this build, i will add photos in a few days.

Would i be ok power wise adding another hd 7970C windforce for crossfire, or am i cutting it tight.

CPU. Intel Core i5-3570K 3.4GHz Quad-Core Processor
CPU Cooler. Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler using push & pull config.
Motherboard. MSI Z77A-GD55 ATX LGA1155 Motherboard
Memory. G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory
Storage. Seagate Barracuda Green 1TB 3.5" 5900RPM Internal Hard Drive
Samsung 840 Series 120GB 2.5" Solid State Disk
Video Card. Gigabyte Radeon HD 7970 3GB Video Card
Optical Drive. Samsung SN-208DB/BEBE DVD/CD Writer
Power Supply. XFX 750W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply
Case. NZXT Phantom 410 (White) ATX Mid Tower Case running 7 fans. 6- 120s & 1- 140

I hope so as it arrives tomorrow lol

Regards Dark matter

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February 4, 2013 5:05:28 PM

Outlander's post is pretty good. I used a wattage calculator, and it came out to be 730 watts, without your extra case fans. With a 750 watt PSU, you would be cutting it close.

XFX makes good PSU's and it could handle it without issue, but I wouldn't overclock anything.

If you already have your computer together you have a tough decision to make. If you still have the PSU new in box, I would return it for their 850 watt PSU.
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February 4, 2013 5:09:13 PM

No, you're fine, that psu will do for two 7970 CF.
It's a quality psu with more amps/wattage than required.
Nothing to be worried about.
February 5, 2013 10:24:27 AM

zared619 said:
Outlander's post is pretty good. I used a wattage calculator, and it came out to be 730 watts, without your extra case fans. With a 750 watt PSU, you would be cutting it close.

XFX makes good PSU's and it could handle it without issue, but I wouldn't overclock anything.

If you already have your computer together you have a tough decision to make. If you still have the PSU new in box, I would return it for their 850 watt PSU.


Thanx
I already have my xfx 750w installed. I did not count on getting a 2nd hd7970c so quick as this was my xmas new build from santa. :) 
February 5, 2013 10:43:43 AM

djangoringo said:
No, you're fine, that psu will do for two 7970 CF.
It's a quality psu with more amps/wattage than required.
Nothing to be worried about.


I wanted that name :( 
Thanx for that. So would oc be out of the question. I suppose with 2 hd7970c's windforce i would not need to oc. I have 1 hd7970c in my build which has the latest driver on it. My question would be when adding the other hd7970 for xfire would i still have to wipe the driver first then update both together with amd catalyst. I enjoyed ths build but things are getting tricky for me adding the 2nd card. I ready somewhere i need to download driver to desktop, wipe driver on the card then go in with driver sweeper to make sure all files are wiped. Unsure about using 1 or 2 xfire bridges, apply driver, make sure xfire is enabled then wipe the sweat from my forehead phew & reboot.

Looking forward to this reply.

Dark matter
!