Will a 750Watt PSU enough for water cooling and 2 Graphic Cards?

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Hogomolo

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Oct 22, 2014
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I'm building a new Gaming/Somewhat Intense PC. As of now I will have either a 4th gen i5 or i7 CPU, with one R9 280X. I know that these should be easily supported by a 750W PSU (UltraHS750). However, If I was to upgrade by adding water cooling and another R9 280X will it still support them?
Other parts: 1TB 7200 HDD, 16GB RAM (2 x 8Gb), 4 Fans, and an Optical Drive. Will it be able to support an SSD as well? Thanks in advance.
 
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jaimelmiel
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jaimelmiel

jaimelmiel

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May 7, 2012
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The 750 watt supernova may not work. The recommended wattage is 900 for the 280x crossfire setup. I would use the calculator on this link an go with no less than a 850 Watt supernova. You may get by with that. You always want a little or more extra with a power supply.


 
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Suztera

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Mar 18, 2014
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Recommended is exaggerated . It should be fine with a decent 750W.

AMD R9 280X - On your average system the card requires you to have a 550 Watt power supply unit.
AMD R9 280X Crossfire - On your average system the cards require you to have a 750 Watt power supply unit as minimum.
 
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jaimelmiel

jaimelmiel

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I agree on the minimum 750 Watt. In my recommendations I err on the side of caution. He may decide on adding things.
He may not. He may get the overclock bug. He may not. That is why all PSU recommendations are at least slightly exaggerated. You do not want to come up short. And make sure it is a gold one.
 
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Suztera

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The 80+ plus rating is just the efficiency in converting AC to DC, it does have a factor in determining quality but it is not the main one. A psu can be 80+ gold but can be junk compared to other offerings.
Decent brands are Tier 1 and 2. Normally Seasonic, XFX, EVGA SuperNova G2 series, etc...
Water cooling doesn't take that much extra watts. A decent 750W is fine with overclocking R9 280X crossfire builds.
One hard drive and one SSD doesn't take much power compared to other components.

To the OP, most SSD take 3-5 watts. HDD is around 6-8 W
 
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jaimelmiel

jaimelmiel

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It goes without saying that it needs to be a Quality line such as the Evga supernova.
If it is a good one that is gold it will in almost all cases put out a few more watts. That cannot be denied.
You never want to cheap out on a PSU. Also he has a water cooler pump possibly in the future. But iam not disagreeing with
you really. I always err on the upside. That is all.
 
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