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Power supply for R9 280X & 7950 crossfire

post #1 of 18
Thread Starter 
Hello everyone. A friend of mine is selling his Sapphire R9 280X Toxic and I'm thinking of buying it in order to crossfire it with my current 7950. The thing is I'm probably gonna need a new psu as well.
What's the minimum wattage for a power supply i'm gonna need?
I'm looking at some 750w units such as the Coolermaster GX750M which seems to be in the sweet spot regarding money. Is it gonna cut it or should I choose a 850w unit?
The rest of the system is in my sig. I'm probably not going to overclock the cards.

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The Steeler
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post #2 of 18
You need not need even 750W as even a 650W would do. Get a EVGA P2 650W or Antec Earthwatts 650W or a Seasonic 650W unit. All should be okay since you wont be overclocking your processor or your cards
Edited by huzzug - 9/21/15 at 4:21am
post #3 of 18
The Coolermaster GX750M isnt the greatest of PSU's tbh.

A high quality 750W PSU can work with 280x's but you shouldnt be overclocking them much.

I would go with a quality 850W PSU so you have some OC headroom to.

http://www.overclock.net/t/183810/faq-recommended-power-supplies#user_800-999W
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post #4 of 18
i run 2 8gb 290x's plus watercooling & 4 HDD's on an 850w psu. I could probably do it with a 750w but i like a little overhead incase i add more componants.
This website is fairly accuret when it comes to Wattage requirements https://uk.pcpartpicker.com/
I say fairly because it doesn't always have the data for every single componant.

If you pick a 750w psu and then input all of your other componants it will let you know by highlighting the PSU section if it thinks you need more power.
post #5 of 18
I ran 2 x 7950's on my current sig rig for a short while before upgrading. My Corsair TX750 had no issues, so as long as it's a quality 750w unit you will be fine.
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post #6 of 18
Thread Starter 
First of all, i made a mistake, it's actually a G750M PSU. For 3 Euros more i can get an XFX TS 750w. I don't really know much about XFX PSUs, but from what i can see this one is an 80+ bronze PSU and gives 62A @ 12v, which from the little i know seems enough. Would that be enough?
PCPartPicker gives me 754w, BUT with 2x R9 280X Toxic as i cannot add two cards of a different kind. I guess that says it'll be enough for my cards, but maybe cutting it a little close. 850w Units are out of my budget right now, as the cheapest of them is at around 140-150 Euros.
The next option is a Corsair CX750 for 15 more Euros and a CX750M for 20 more. They're stretching the budget a little, so i might have to convince my friend to drop the GPU price a little, but i don't wanna do that as he already did a good "friend" discount tongue.gif
Edited by tasospaok123 - 9/21/15 at 7:39am
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The Steeler
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post #7 of 18
But one thing that beats me is that if you do not plan is to overclock your cards and your locked processor, why would you get a 750W which would be truly overkill unless the difference between the 650 & 750W isn't truly great. Where would you be making the purchase & what is your budget ? Also,the XFX is also a good brand if you still wanna pursue it.
post #8 of 18
Thread Starter 
Quote:
Originally Posted by huzzug View Post

But one thing that beats me is that if you do not plan is to overclock your cards and your locked processor, why would you get a 750W which would be truly overkill unless the difference between the 650 & 750W isn't truly great. Where would you be making the purchase & what is your budget ? Also,the XFX is also a good brand if you still wanna pursue it.

I don't know about overclocking the cards though. My original thought was to keep my 7950's overclock to its current "7970" levels so my crossfire would perform closely to 2x R9 280X (or 7970s).
I don't really want to be cutting it close. If 650w seems enough, then i should get some molex to 6pin adapters and try this on my current PSU. So if my 600w won't work, but a 650w unit works then I'll probably be really close to the edge, if you know what i mean. Also, i need it to be futureproof, because I'm sure I'm gonna get more hard drives or an i7 in the future. I don't want to consider that my psu might not cope with any new stuff.

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post #9 of 18
750 W is actually recommended for his application
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post #10 of 18
Thread Starter 
Yeah, i'm probably gonna go with a 750w unit. It seems enough. As i said, the only reason i'm considering a bigger unit would be for any upgrades in the future. But i believe my next GPU will be a single one, thus taking load off the PSU.
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The Steeler
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