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PSU : How much watts does my system need?

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July 10, 2013 12:44:27 PM

Hello everyone i'm planning on buying a new system with the following hardware so my question would be how much watts would my system need? im thinking 750 would be fine but in not sure. Any suggestions would be great!

My hardware :

CPU :INTEL CORE I7-3770K 3.50GHZ LGA1155
GPU :ASUS GTX660 TI-DC2-2GD5 2GB PCI-E
M/B : ASUS P8Z77-V LX2
RAM : CORSAIR CMV4GX3M2A1333C9 VALUE SELECT DDR3 4GB (2X2GB) PC3-10666 (1333MHZ) DUAL CHANNEL KIT

HDD/SSD : probably 1 500G HDD and 1 120G SSD

More about : psu watts system

July 10, 2013 12:48:17 PM

550w is all you need. at least 700w if you want to add another gpu in the future
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a b ) Power supply
July 10, 2013 12:50:50 PM

750 being 'fine' yes, a single rail 400 or more would probably be fine as well. I know my 3570K that is slightly OC'd with a 670 only pulls about 310 watts from the wall and since my PSU is about 85% efficient that measn it's getting just under 265 watts to the machine on the DC side.

Unless you have SLI or some very interesting power needs there is rarely any reason to get over a 500watt PSU these days for normal semi-high end gear.


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July 10, 2013 12:55:21 PM

Go with a quality 500-600watt Seasonic PSU. Like a Seasonic X series 560. Never go with more than one GPU. Always just get a stronger GPU if your budget allows it. You can get a better GPU(with the savings) if you go with an I5-3570k or the Haswell equivalent. If this is a gaming rig you wont benefit from the I7's.
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July 10, 2013 1:06:17 PM

colsanders said:
Go with a quality 500-600watt Seasonic PSU. Like a Seasonic X series 560. Never go with more than one GPU. Always just get a stronger GPU if your budget allows it. You can get a better GPU(with the savings) if you go with an I5-3570k or the Haswell equivalent. If this is a gaming rig you wont benefit from the I7's.


I feel like it's tough to say NEVER go with a multi-GPU set up as the technology that drives them has improved dramatically. Perhaps a better way to say it would be never get two weaker GPUs over a single more powerful GPU?

Otherwise I agree with the other posts about getting a quality PSU made by Seasonic or one of the many vendors that rebrands Seasonic's products. In my opinion it's worth it to invest in a power supply that gives you plenty of breathing room and will last for years even if you have to spend more up front to get it. One like this: http://www.newegg.com/Product/Product.aspx?Item=N82E168... , while not necessarily the cheapest solution could probably be carried to every build you do in the foreseeable future. I've been using the 1000W variant of that PSU and it's been just excellent.

Hope that helps!
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