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Corsair HX850 Powerful enough for GTX580 SLI on my rig?

Last response: in Components
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March 18, 2012 5:30:59 AM

My rig is as follows:


Intel Core i7 2600K Quad Core Unlocked Hyperthreading Processor LGA1155 3.4GHZ Sandy Bridge 8MB
Corsair Cooling Hydro Series H80 High Performance CPU Cooler System LGA775 1366 1156 1155 AM2 AM3
ASUS Maximus IV EXTREME-Z Rog LGA1155 Z68 4PCI-E16 PCI-E4 PCI-E1 Lucidlogix Virtu Motherboard
Corsair CMZ8GX3M2A1866C9 Vengeance 8GB 2X4GB DDR3-1866 CL9-10-9-27 Memory Kit
GeForce GTX 580 772MHZ 1536MB 4GHZ GDDR5 PCI-E Dual DVI-I Mini HDMI
Cooler Master Haf 932 Advanced Full Tower EATX Case 7X5.25 2X3.5 5X3.5INT USB3.0 eSATA 1394 Black
Corsair Professional HX850W 850W ATX 12V 70A 24PIN ATX Modular Power Supply Active PFC 140MM Fan
Microsoft Windows 7 Home Premium Edition 64BIT SP1 DVD OEM
Seagate Barracuda 1TB 7200RPM 64MB SATA 6Gbps 3.5IN Internal Hard Drive - OEM
Intel 510 Series 120GB Solid State Drive SSD 2.5IN SATA 6GB/S Elm Crest

I have my CPU Oc'd to 4.6GHz, I just ordered my second GTX580 and it will arrive Tuesday, however after the fact I realized my PSU might not be enough to handle them together. Research on my own left me with mixed results, some people say the HX850 is enough to handle them - albeit barely under load. Other say that an upgrade would be needed to even consider this. I CAN get a new PSU however I don't know how to swap it on my own etc.

If anyone can provide some insight as to if I need a new one immediately or if I could keep using it for a month or two and then upgrade.

I could upgrade immediately if someone could explain the process of swapping the PSU. :]

I appreciate your insight in advance, thanks.
a c 144 ) Power supply
March 18, 2012 6:34:52 AM

I'd say your present PSU will handle handle a pair of 580's - barely.

A pair of GTX580's needs about 40 amps peaking to 50 amps. Your CPU will need about 10 amps.

The HX850 is a pretty good PSU. I estimate, that fully loaded, it be running at about 90% of capacity.
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March 18, 2012 6:58:39 AM

If your investing that kind of money on GFX cards why skimp on the thing that can damage them?

I recommend a gold or platinum PSU that can work on 50%-60% when your config is at full load. If your going to overclock, you dont want to stress your PSU and make it degrade even faster. It can kill your cards, which aren't cheap.

How: To Change A Computer PSU Power Supply Unit >>>> http://www.youtube.com/watch?v=emuiTZ9K49M&feature=rela...
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a b ) Power supply
March 18, 2012 7:46:47 AM

HX850 is great but gtx 580 SLi will eat it up(will run but under load).pc power and cooling 950w will do fine.it's cheap,reliable and 80+ silver certified.
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March 18, 2012 10:07:22 AM

theconsolegamer said:
If your investing that kind of money on GFX cards why skimp on the thing that can damage them?

I recommend a gold or platinum PSU that can work on 50%-60% when your config is at full load. If your going to overclock, you dont want to stress your PSU and make it degrade even faster. It can kill your cards, which aren't cheap.

How: To Change A Computer PSU Power Supply Unit >>>> http://www.youtube.com/watch?v=emuiTZ9K49M&feature=rela...


I've already built my rig, so the question was more adding the second GTX580 and was wondering if the PSU needed an immediate swap. I wanted to know more because my rig is just a little over a month old, so I didn't want to swap out a brand new PSU if I didn't have to.

All that in mind I did order a Corsair HX1050w to replace it, so my power problems should be fine. I appreciate the guide.
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a c 1203 ) Power supply
March 18, 2012 6:31:57 PM

For a system using two GeForce GTX 580 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 900 Watt or greater power supply that has a combined +12 Volt continuous current rating of 65 Amps or greater and that has at least two 6-pin and two 8-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

The Corsair Professional Series HX850W (CMPSU-850HX), with its combined +12 Volt continuous current rating of 70 Amps and with six (6+2)-pin PCI Express supplementary power connectors, is sufficient to power your system configuration with two GeForce GTX 580 in 2-way SLI mode.
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a b ) Power supply
March 18, 2012 7:22:35 PM

A corsair HX 850 is a fine psu. It'll power the GTX 580 SLI just fine and is a very very high quality unit. The amount of power usage will be very high but the PSU can handle it.

No need to worry.
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March 19, 2012 1:00:48 AM

Best answer selected by rukevre.
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a b ) Power supply
March 19, 2012 9:31:41 AM

This topic has been closed by Maziar
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