Cross Fire 2 x 280X on 750w

josh_withey · Jan 14, 2014

My current build is:
i5 4570
2 x 4gb ram
1 x MSI 280X
Corsair CX 750M
Could I add another 280x or not.
Also, if i do add another, does it need to be the same MSI branded one, or could it be another brand? (eg saphire)

Avro Arrow · Jan 14, 2014

You should have no problems and brand doesn't matter. They will crossfire just fine.

Dark Lord of Tech · Jan 14, 2014

Corsair CX 750M < I wouldn't with that CX Series power supply.

You should go with 850w. SEASONIC , XFX , Antec.

L Helps · Jan 14, 2014

Will work and it's better to get one that's exactly the same. But why do you want to get a second card?

firo40 · Jan 14, 2014

It can be any brand

muathmelhem35 · Jan 14, 2014

Although it is the minumum PSU that may handle 2x 280x cards. It should work
Maximum power draw for 280x OC = 347

Maximum load that CX 750M can handle on +12v is 744 (> 2x347)

jb6684 · Jan 14, 2014

No Crossfire of R9 280X's with that supply....

http://www.guru3d.com/articles_pages/radeon_r7_260x_r9_270x_280x_review_benchmarks,10.html

System: 200 watts
R9 280X : 250 watts each
Totals about 700 watts...

In practice, my CF 280X system draws 650watts gaming and 700watts gaming if I OC the CPU..... too much load for builder level supply. Get an HX or AX 850 will run fine then...

muathmelhem35 · Jan 14, 2014

jb6684 :

on paper, it is enough
"AMD R9 280X Crossfire - On your average system the cards require you to have a 750 Watt power supply unit as minimum."
http://www.guru3d.com/articles_pages/msi_radeon_r9_280x_twinfrozr_gaming_oc_review,8.html

Avro Arrow · Jan 14, 2014

His system doesn't seem overly-complicated and the i5 doesn't draw much juice. He only has 2 DIMMs and a hard drive. I still think that he should be fine. I have an OCZ Z-Series 1000W modular PSU and I'm running twin overclocked HD 7970s (same as R9-280X), an FX-8350, 4 hard drives, an SSD, 4 RAM DIMMs, 3 120mm case fans and a myriad of USB devices. My PSU doesn't even struggle. I think that he should be fine.

josh_withey · Jan 14, 2014

So technically I could, but it would be a tight fit?

Avro Arrow · Jan 14, 2014

josh_withey :

I would say to try it out. It won't be enough to blow anything up and if you have problems with crashing or freezing, then buy a new PSU. I think it will be fine.

muathmelhem35 · Jan 14, 2014

josh_withey :

Yes, for example you may have problems at OC

muathmelhem35 · Jan 14, 2014

Avro Arrow :

The difference between 1000W and 750W is great
But the difference between your systems is not so big - All other things does not draw a considerable power in comparison with one mid high end GPU

josh_withey · Jan 14, 2014

Sorry, I have 2 hdd's, should have specified. I think ill get a larger psu before i do anything else, so then ill have room to upgrade ram, add an ssd and add another gpu

skylite88 · Aug 24, 2014

with a cx750w and a sapphire 280x oc version my system is struggling whenever i start playing games it starting freezing and display driver stopped. now i will have to buy a new psu because it can't supply my 280x

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Cross Fire 2 x 280X on 750w

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