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Need advice re GPU (660 GTX vs 7850) and PSU requirements

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October 15, 2013 12:26:48 PM

Hi. New to the site. I have a three-year old build and I am looking for advice re upgrading my GPU.

Current system:
Windows 7 Home Premium Edition 64bit OEM
Processor: AMD Phenom II x4 965 Black Edition
Motherboard: Asus M4A79XTD Evo ATX AM3 790X
RAM: G.Skill F3-12800CL9D-4GBRL Ripjaws PC3-12800 4GB (2x2GB) DDR3-1600
Video: Powercolor Radeon HD 5770 850MHz 1GB 4.8GHz
System drive: Western Digital Caviar Black 640GB
2nd drive: WD Caviar Blue 1TB
PSU: OCZ Fatal1ty 550W ATX12V 20/24pin Active PFC ATX Modular 120MM fan.
Display: Samsung Syncmaster 275T at 1920x1200

I am looking to upgrade and have found a couple of cards at fairly good prices:

EVGA GeForce GTX 660 SUPERCLOCKED 2048MB GDDR5 DVI HDMI DP Graphics Card - $175

MSI R7850 Twin Frozr OC AMD Radeon HD 7850 2GB GDDR5 DVI/HDMI/2xMiniDisplayPort PCI-Express Video Card - $150

I have no interest in overclocking and am not especially concerned with maxing out settings while gaming. I currently have no intention of replacing either my board nor CPU.

So..

1. Any preference between the two, or alternative recommendation at the price point?
2. Any conflict between board and either of these cards?
3. Will my PSU handle either of those cards?

Thanks in advance for any assistance.
October 15, 2013 2:18:58 PM

Thanks for the reply, rolli59.

I read in a couple of places that the 660 needs 450W/24A and 7850 needs 500W/21A AT MINIMUM, and that my PSU has a max load of 450W. I have no idea whether or not this factors in the power needed for everything else (CPU/RAM/HD etc). Those online power supply characters are of no help.

I have to admit that my brain hurts when it comes to this sort of stuff, but that seems like the PSU is just barely good enough. Am I missing something in the consideration?


I saw that price at newegg; but since I'm in Canada, I can't shop that site (I've tried, but no go). Fortunately, it's the same via Amazon. For the same reason, I won't be able to use the rebate.
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October 15, 2013 6:03:56 PM

Your PSU is 550watts with capable off delivering 450watts on the +12 volts alone and that is constant power not peak. It will handle that fine since it exceeds both requirements which is total watts and total amps combined on the +12 volts.
My daughter has one in a rig with 990FX board OC FX8350 and HD7850 and no problems.
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Best solution

October 15, 2013 8:20:25 PM

kushiro said:
Thanks for the reply, rolli59.

I read in a couple of places that the 660 needs 450W/24A and 7850 needs 500W/21A AT MINIMUM, and that my PSU has a max load of 450W. I have no idea whether or not this factors in the power needed for everything else (CPU/RAM/HD etc). Those online power supply characters are of no help.

I have to admit that my brain hurts when it comes to this sort of stuff, but that seems like the PSU is just barely good enough. Am I missing something in the consideration?


I saw that price at newegg; but since I'm in Canada, I can't shop that site (I've tried, but no go). Fortunately, it's the same via Amazon. For the same reason, I won't be able to use the rebate.


$10 more in Canada if you catch the sale and claim the rebate.

http://www.ncix.ca/products/?sku=76220&vpn=02G-P4-2662-...
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