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Power Supply calculation

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June 9, 2011 7:11:07 AM

I am in the process of building a desktop PC but am at a loss as to how to calculate how big of a power supply to get for it. I am getting close to finishing my build and dont want to end up frying everything.

Heres what I have for a build.

AMD Phenom II X6 1100T processor
Gigabyte GA880 motherboard
Barracuda 500GB 7200RPM hard drive
Optical drive (DVD ROM) want to upgrade to a burner as i just pulled this out of my old pc.
4 system fans. not sure on the size but they look fairly small.
i want to allow wattage for a fairly top of the line graphics card as well.
either 1 4gb ddr3 memory or 2 2gb ddr3(not sure yet) opinions on whether one 4gb or two 2 gb cards is better than the other. dual channel.

So far thats what is going in it. Not sure if any other info is needed but will definitely appreciate any tips or info i can get. ive checked out PSU calculator on NEWEGG but not entirely sure if i entered everything correctly. it told me something like 650W PSU. dunno if that sounds about right or if i should go with around 750W for future upgrading. Any ideas?
a b B Homebuilt system
a b ) Power supply
June 9, 2011 7:58:48 AM

if you only going to use one graphics card, 650W should be enough.

otherwise get an 850W or 1000W
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a b B Homebuilt system
June 9, 2011 8:18:15 AM

If you want to SLI or crossfire anything 6970/570 and below, a 750w PSU will do quite well.
For a single card, a nice 500w-600w PSU is what you need.

Also, have you looked into getting a 2500k+P67 build? It's much more powerful for not much more than the 1100t and 880G. http://www.anandtech.com/bench/Product/203?vs=288
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Best solution

a b B Homebuilt system
a c 139 ) Power supply
June 9, 2011 5:57:46 PM

You can use this:

http://www.antec.outervision.com/

But in no case would I get anything less than a 650 watter.

1. There is no real cost savings for going smaller, at least among quality units, and

2. A PSU hits peak efficiency at 50% load.

For twin GFX of 6950 / 560 go to a 750 watter.....twin 570's an 850 watter. Above that, I 'get a 900 watter
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a b B Homebuilt system
June 9, 2011 10:54:41 PM

1100T 125w tdp
880g 18w tdp
HDD 20w
DvD 20w
Fan 1-2w per fan (Unless there ridiculous like a Delta or something)
60w for funz
Total=~250w
6950 200w tdp 6970 250w tdp 6990 375w tdp
560Ti 170w tdp 570 219w tdp 580 244w tdp 590 365w tdp (skeptical on the 590)
Total= 450w for 6950/560Ti 500w for 6970/570 550w for 580 650w for 6990/590/
6950CFX/560Ti SLi 750w for 6970CFX/570SLi/580SLi 850w for 6990CFX/590SLi
I would say high quality 600w for single card and 800w for dual card to saty in the peak efficiency zones of the power supply. Hope this helps and like others I ask if you already have these parts or not? If not consider a Sandy Bridge i5 2400/2500k build for better performance and less watts :p 
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June 10, 2011 2:35:08 AM

The 750w for GTX 580 SLI recommendation is wrong, at least a 900w for GTX 580 SLI. I wish I new that before I bought my PSU. Stuck with my current set up or have to buy a new PSU with a second card :( 

AnandTech showed that 580 SLI needed 777w in benchmarking, you're cutting the rest of your system short at 850w.
http://www.anandtech.com/show/4012/nvidias-geforce-gtx-...

Guru3D showed 719w for GTX 580 SLI or 447w for a single card.
http://www.guru3d.com/article/geforce-gtx-580-sli-revie...

But you haven't said what card you were interested in so this information means nothing to you (leviot85), but should mean facts to you MGF Derp.
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a b B Homebuilt system
June 10, 2011 3:52:14 AM

joshyboy82 said:
The 750w for GTX 580 SLI recommendation is wrong, at least a 900w for GTX 580 SLI. I wish I new that before I bought my PSU. Stuck with my current set up or have to buy a new PSU with a second card :( 

AnandTech showed that 580 SLI needed 777w in benchmarking, you're cutting the rest of your system short at 850w.
http://www.anandtech.com/show/4012/nvidias-geforce-gtx-...

Guru3D showed 719w for GTX 580 SLI or 447w for a single card.
http://www.guru3d.com/article/geforce-gtx-580-sli-revie...

But you haven't said what card you were interested in so this information means nothing to you (leviot85), but should mean facts to you MGF Derp.


Plus 1 to that. However, I think Derp was just trying to outline what he thought you would need. I for instance disagree that a 6990 CFX/ GTX 590 SLI only needs 850w. There's no way I would run one of those systems with a PSU under a kilowatt (80+, of course) I think he was doing a bit of best answer hunting too.
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June 10, 2011 8:36:04 AM

thanks for the tips! a lot to keep in mind. I have already purchased what i plan to work with. was just wondering about the power supply. the purpose of this build is to have good to ultra quality gaming. I havent decided on a video card yet because its really confusing to know what is "overkill" and when I'm spending way too much for something that i dont really need. I was looking at Gigabyte GV R587D5-1GD-B Graphics adapter - 1 GB - GDDR5 SDRAM. Not sure if this will give me the maximum benefit graphics wise or if its actually a little overkill. I also decided to go with the phenom II X4 980 BE due to the fact that the X6 wont really help me out with gaming because its not possible to access the extra cores. Any ideas on graphics cards in the $100-$350 range that wouldnt be a waste?
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June 10, 2011 8:49:37 AM

and yes i want to only rely on one graphics card. also idk if it matters but i plan to use a 32 inch panasonic LCD tv as the monitor.
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June 17, 2011 12:17:35 AM

Best answer selected by leviot85.
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August 6, 2011 1:24:32 AM

Here is one may suitable to you

http://azsurplus.com/index.php?main_page=product_info&c...


leviot85 said:
I am in the process of building a desktop PC but am at a loss as to how to calculate how big of a power supply to get for it. I am getting close to finishing my build and dont want to end up frying everything.

Heres what I have for a build.

AMD Phenom II X6 1100T processor
Gigabyte GA880 motherboard
Barracuda 500GB 7200RPM hard drive
Optical drive (DVD ROM) want to upgrade to a burner as i just pulled this out of my old pc.
4 system fans. not sure on the size but they look fairly small.
i want to allow wattage for a fairly top of the line graphics card as well.
either 1 4gb ddr3 memory or 2 2gb ddr3(not sure yet) opinions on whether one 4gb or two 2 gb cards is better than the other. dual channel.

So far thats what is going in it. Not sure if any other info is needed but will definitely appreciate any tips or info i can get. ive checked out PSU calculator on NEWEGG but not entirely sure if i entered everything correctly. it told me something like 650W PSU. dunno if that sounds about right or if i should go with around 750W for future upgrading. Any ideas?

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!