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390x CF users, what PSU are you using?

post #1 of 9
Thread Starter 
?? I currently have a single 390x. Just got it. Im considering returning it for a 980ti, but the thought crossed my mind to try a second one in CF. I know everyone always says that a single card is better, and I get that. But I already have one. Now, as for PSU Im running an RM750. PC Part picker says I would be at almost 800w with my 5820k and a 390x CF setup. So in the name of making it safe, Id need a 1000w PSU I assume? Which one and do people really have to run that high of a PSU for these cards?

If so, this has become almost more of a PITA than its worth. And since I have the unique situation of being able to return the card, maybe I should just do that and spend the extra $300 for the 980ti. Because otherwise another 390x would be $400 plus another $179ish for the RM1000 PSU at the very least. Id like to even run a better grade PSU and the cost just goes up. Please let me know what the group thinks.
post #2 of 9
Quote:
Originally Posted by ZXMustang View Post

?? I currently have a single 390x. Just got it. Im considering returning it for a 980ti, but the thought crossed my mind to try a second one in CF. I know everyone always says that a single card is better, and I get that. But I already have one. Now, as for PSU Im running an RM750. PC Part picker says I would be at almost 800w with my 5820k and a 390x CF setup. So in the name of making it safe, Id need a 1000w PSU I assume? Which one and do people really have to run that high of a PSU for these cards?

If so, this has become almost more of a PITA than its worth. And since I have the unique situation of being able to return the card, maybe I should just do that and spend the extra $300 for the 980ti. Because otherwise another 390x would be $400 plus another $179ish for the RM1000 PSU at the very least. Id like to even run a better grade PSU and the cost just goes up. Please let me know what the group thinks.

I had a heavily oc'd 2600k and two oc'd 290s on a NZXT Hale90+ 750w PSU, never had any problems.

 

I think you should return the 390x and get the 980ti. One card is always a better experience than two cards.

Guts (4k gaming)
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Guts (4k gaming)
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post #3 of 9
Thread Starter 
Im leaning toward just returning it. But the tech guy in me wants to experiment with the CF setup. Plus I do know that two 390x's in CF would destroy a single 980ti in both raw performance and with VRAM size. I know VRAM doesnt currently stack, but the 390x does have 8gb ram per card and the 980ti only has a mere 6gb... And we know that with the muscle of a second card, the 8gb VRAM would be a huge help going forward. I get my GTAV over 4.5gb vram usage in 1440p easy. Thats approaching the 6gb cap of a 980ti.
post #4 of 9
In your case . . . you might be better off with the 980Ti. But if the tech in you prevails, an 850W from EVGA would suffice. Keep the gpus at stock.
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post #5 of 9
I have 2 r9 290's and I run a 1000w EVGA psu. I would advised on getting the 980ti while I love crossfire and it is awesome when it works both amd and publishers have done a poor job supporting crossfire, for example fallout 4 just got a crossfire profile but the latest patch from Bethesda makes crossfire completely unusable. If you are comfortable with the known issues then crossfire is a great option.
post #6 of 9
Would advise a decent 850W. It can be done with a good 750w (I did it with CF 290s), but that is cutting it a bit close when you start overclocking.
post #7 of 9

with 3770K.
post #8 of 9
Thread Starter 
Well Im OCd on my 5820k. Its at 4.4@1.300v. I wouldnt OC the 390x's. There would be no need. They will be powerful enough. I would also need a modular psu. My system is all wired up to perfection and I wouldnt want to redo all that.
post #9 of 9
I don't tend to trust HardOCP's wattage readings.

Guru3D Review
Core i7 3960 Extreme (Sandy Bridge-E) @ 4.6 GHz
290X CFX System Load (In-Game): 551W
290X CFX Full GPU Load : 661W

(FYI 290X, 390X use around the same power)

Source: http://www.guru3d.com/articles_pages/radeon_r9_290x_crossfire_vs_sli_review_benchmarks,4.html

For 390X CFX and an OC'ed CPU, go with a strong 850W PSU:

CoolerMaster V850W
http://www.coolermaster.com/powersupply/enthusiast-v-series/v850/

SeaSonic Platinum 860W
http://www.seasonicusa.com/Platinum_Series_XP2.htm

Corsair AXi860W
http://www.corsair.com/en-gb/ax860i-digital-atx-power-supply-860-watt-80-plus-platinum-certified-fully-modular-psu-uk
Edited by BradleyW - 2/4/16 at 7:36am
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X79-GCN
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Hard DriveCoolingCoolingCooling
Samsung 840 Pro 120GB EK Supremacy (CPU) NF F12's P/P (360 Rad)  NF A14's (420 Rad)  
CoolingCoolingCoolingCooling
XSPC Chrome Compression Fittings EK RES X3 150 Primochill PremoFlex Advanced LRT Clear 1/2 ID EK-FC (R9 290X) 
CoolingCoolingCoolingOS
EK D5 Vario Top-X  Phobya G-Changer V2 360mm Phobya G-Changer V2 420mm Win 10 x64 Pro 
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