Is Corsair CS 650 M enough to power XFX R9 280 DD 4 GB?

jplv1

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I'm considering buying this card : http://www.amazon.co.uk/gp/product/B00J44WVYG/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A3P5ROKL5A1OLE

On Amazon it says the wattage for it is 750W, however, on some benchmark sites the real wattage sits far bellow it, this one says the cards max is 305W : http://www.bit-tech.net/hardware/graphics/2014/05/19/amd-radeon-r9-280-review-feat-xfx/9

I will be running an intel i5 4670k, an a couple of Noctua 140mm PWM fans, so I guess that won't add much to the wattage.

I hope someone can help me out with this.
 
Solution

Nope, that review says the entire system is drawing 305W from the wall. Power supplies are rated by what they can deliver to components, which does not include whatever is lost inside the power supply itself. So we first have to convert the 305W at the wall to the wattage the components draw from the power supply.

Jonnyguru found that PSU to be about 90% efficient when drawing ~360W from the wall, so let's just use that as an estimate. Then 305W x 90% = 275W of power draw by...

Nope, that review says the entire system is drawing 305W from the wall. Power supplies are rated by what they can deliver to components, which does not include whatever is lost inside the power supply itself. So we first have to convert the 305W at the wall to the wattage the components draw from the power supply.

Jonnyguru found that PSU to be about 90% efficient when drawing ~360W from the wall, so let's just use that as an estimate. Then 305W x 90% = 275W of power draw by components. But that's from ALL the components in the system, including an overclocked Core i5-3570K.

So we should definitely subtract more than 50W to get the power consumption of the card itself. Exactly how much is hard to say. But it's a safe bet that the R9 280 was drawing less than 225W at full load in that review.
 
Solution

jplv1

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So I'm guessing that PSU will leave plenty of room if I decide to upgrade the GPU or CPU in the future, right?
 

jplv1

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Ok then, assuming the 650 watts version really is enough, if I go with the 600 watts version, like the CX 600 M, will it still perform fine and give me ample room for upgrades? So I can save a couple of pounds.