what watt psu do i need for crossfire

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markedog

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Apr 17, 2013
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i need to know what watt of psu i need for a fx-320 overclocked to 4.2hgz with a hd 7970 1ghz and a hd 7950 oc to 1ghz in crossfire mode i am wanting to overclock the hd 7970 but dont know what wattage psu i need
 
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cub_fanatic
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markedog

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Apr 17, 2013
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hi
thxs for the reply would a 750w psu be enough for a over clocked fx 8320 @ 4.2ghz and hd 7970 crossfire with hd 7950 with no overclock on the gpu only cpu?
 
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cub_fanatic

cub_fanatic

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Nov 21, 2012
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750 watts is right around the minimum for CFX 7970's. The 7950 uses less power but I'd shop for a PSU like I was shopping for 7970 GHz Crossfire. If you are just gaming on this PC, then it'll most likely work fine even with a mild OC of the GPUs and the CPU. Gaming doesn't peg the GPU load at 100% straight all the time so you probably won't experience any issues gaming. But, if you are using apps that do peg the CPU and GPU close to 100%, I'd go with an 800 or even 850 watter just to be safe. Either way, it is better to play it safe and give yourself a little more headroom than you actually need. Price differences between quality 750, 800 and 850 watt units aren't that big. But, I'd rather get a high quality, good brand 80+ gold 750 watt unit than a cheap-o 850 watt one.
 
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markedog

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Apr 17, 2013
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hi

i have just bought a new psu but dont know if it is any good as it a 850w 80 plus bronze and it says that the Output Capacity 850W with a max Max. Output Capacity 1020W i dont know what that means the psu i have bought is a cooler master RS-850-AMBA-J3
 
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cub_fanatic

cub_fanatic

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Nov 21, 2012
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Max wattage is pretty much a theoretical figure. 850w is the "safe" max. As in, it won't start causing problems and malfunction at 850w but if you try to run a bunch of GPUs on it that draw more than 850 total watts, then you'll most likely start experiencing sudden power cut offs or worse damage to your components. Just ignore that number and concentrate on the number that is written on the front of the box. That number, in your unit's case 850w, is what the unit can supply continuously. The 1020w figure is the max the unit can supply for short periods. How long is that? I wouldn't want to find out.

As for the unit itself, it sounds like a pretty good one for your PC. 80 plus bronze isn't top of the line but it is pretty efficient (85% of the power drawn from the wall is used by the system). I also like the 2 year warranty. It should be more than enough for both GPUs with a decent overclock and the CPU with a decent OC as well.
 
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cub_fanatic

cub_fanatic

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Nov 21, 2012
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You can't beat a 5 year warranty and the price is significantly cheaper than that Cooler Master unit. Same specs, also modular, good name brand (EVGA rebranded Super Flower) and better warranty = no-brainer.
 
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