PSU Need for 2x Crossfire R9 290X and OC'ed FX-9370

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DamienEx

DamienEx

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I am feeling a little ashamed not being able to figure this out for myself, but I have read conflicting articles everywhere, used some PSU calculators, and have decided to ask the community.

I am planning on getting 2x R9 290X and running them in crossfire. My system is as follows.

MoBo: ASUS Sabbertooth 990FX R2.0
CPU: AMD FX-9370
RAM: 2x4gb G.Skill 1600mHz 8-8-8-24
Heat Sink: Corsair Hydro Series H100i Water Cooler
HDD: 3x 1Tb 7200RPM 6gb/s
SSD: 1x 120gb
Disc Drive: 1x DVD/CD Burner, 1x Blue-ray Player
Case: Cooler Master HAF 932 Adv
Fans: 8x 120mm LED, 1x 140mm LED, 1x 230mm LED
MISC: 2x Fan Controllers, 4x LED Case Lights, 6x Powered USB Devices

I leave my system running 24/7, most of the time not at load. I turn it off to add components or do random restarts just to give it a fresh start. I game 3-4hrs on a week day and 6-10hrs on weekends so that is when there is the most stress on my system. When I do heavy gaming I will OC my CPU and GPU as needed.

So with all this information, what is the best power supply solution for me. Let me worry about amperage and making sure the rail/rails are correct for all my components, I need raw Wattage. I have gotten numbers from 800w to 1300w so a little bit of assistance on this one would be greatly appreciated.
 
Solution
clutchc
According to this: http://www.hwcompare.com/16010/radeon-r9-290x/
...each R9-290X is a 300W card maxed out. If you ever manage to max both of them out that would be 600W (50A on the +12V rails). Your CPU is the next biggest power hungry device at 220W (18.3A @ +12V) maxed out. http://www.cpu-world.com/CPUs/Bulldozer/AMD-FX-Series%20FX-9370.html
O/C'ing those devices will increase it some. Fans, LEDs, MB, Drives won't make much of a difference when you get into those numbers. I wouldn't feel totally safe with an 850W PSU if you are going to be O/C'ing. Me, I'd be looking at a high end 1000W PSU with sufficient PCIe aux connectors (2 x 8 pin and 2 x 6 pin) for the two cards.

You can always run your system through a PSU Calculator...
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clutchc

clutchc

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According to this: http://www.hwcompare.com/16010/radeon-r9-290x/
...each R9-290X is a 300W card maxed out. If you ever manage to max both of them out that would be 600W (50A on the +12V rails). Your CPU is the next biggest power hungry device at 220W (18.3A @ +12V) maxed out. http://www.cpu-world.com/CPUs/Bulldozer/AMD-FX-Series%20FX-9370.html
O/C'ing those devices will increase it some. Fans, LEDs, MB, Drives won't make much of a difference when you get into those numbers. I wouldn't feel totally safe with an 850W PSU if you are going to be O/C'ing. Me, I'd be looking at a high end 1000W PSU with sufficient PCIe aux connectors (2 x 8 pin and 2 x 6 pin) for the two cards.

You can always run your system through a PSU Calculator for another opinion: http://www.extreme.outervision.com/psucalculatorlite.jsp
 
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DamienEx

DamienEx

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I use that calculator but the thing that throws me off is the capacitor aging and when to use the high loads on those options. It also tells me that when I OC to 5gHz and add some voltage that my power draw on the CPU goes to about 350w. So honestly I am not even sure what values to use in those slots let alone how much they matter for my system. Otherwise using your numbers I am set with my current 1000w supply.

I think I might just be looking into it too much.
 
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clutchc

clutchc

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OK. Then just go with the 1000W you have if it is good quality. That will be plenty. What make/model PSU is it?
 
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DamienEx

DamienEx

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Rosewill RBR1000-M 1000W

I was looking at getting Rosewill LIGHTNING-1000 1000W for the red LED fan to match the color scheme on my case. I needed another PSU for my secondary PC anyway and was going to use the one I have now in that case and just put the lightning in my main PC. I have read reviews and most of them say that the Rosewill Lightning series is good quality (and good looking! [for me anyway])

But yeah if 1000w will do it, no need to jump up to the 1200w supply.
 
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toyftw

toyftw

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Hi - No need to jump to 1200w, since a good 850 will run that system, a 1kw PSU should provide more
than enough headroom.

 
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clutchc

clutchc

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Most of the Rosewill PSUs in that range are good units. Some of the low end ones, not so much. I have used quite a few Rosewills over the years on various builds for folks with no issues. And they are all gaming great to the best of my knowledge. However, the one you list above only has a (combined) 52A +12V rail according to the nameplate. Even though it is rated at 900W. 52A @ +12V might be too light for both cards and CPU maxed out. See my calculations above.
 
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DamienEx

DamienEx

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I in fact do have the one you were looking at. It just happens to be the one I am running right now. However it does not match the color scheme and is being replaced. It will go nicely with my girl friends PC though. Besides, that thing needs a little more juice. Not as much as I am giving it, but you never know what I might end up running in that thing.
 
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