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What Wattage Power supply to use?

Last response: in Components
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March 25, 2012 9:02:28 PM

Hello Tom's Hardware members!
I'm new to the forum but I have build a few computers before. Today my question is, do I have a good selection of hardware for a new build? Things have changed a bit since I build my last pc about 5 years ago.
Heres what I've chosen so far:

CPU ]http://www.newegg.com/Product/Product.aspx?Item=N82E16819115072]
I'm going with i5 because its cheaper and is said to still be great for gaming. i7 is out of my budget.

RAM ]http://www.newegg.com/Product/Product.aspx?Item=N82E16820231455]

Motherboard ]http://www.newegg.com/Product/Product.aspx?Item=N82E16813157271]

GPU ]http://www.newegg.com/Product/Product.aspx?Item=N82E16814127578]

Also, if I use these components, what wattage power supply do I need? I don't want to over spend by getting one that has more than I need.

More about : wattage power supply

a b ) Power supply
March 25, 2012 9:36:38 PM

550w+ w/ at least 40a on the 12v rail

for SLI look at 700w+ w/ 50a+ on the 12v rail
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a c 1175 ) Power supply
March 25, 2012 10:04:47 PM

For a system using a single GeForce GTX 560 Ti graphics card NVIDIA specifies a minimum of a 500 Watt or greater power supply that has a combined +12 Volt continuous current rating of 30 Amps or greater and that has at least two 6-pin PCI Express supplementary power connectors.

For a system using two GeForce GTX 560 Ti graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 700 Watt or greater power supply that has a combined +12 Volt continuous current rating of 52 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.

Overclocking of the CPU and/or GPU(s) or being able to run FurMark or some equivalent GPU stress testing utility will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock and/or GPU stress testing. The additional amount needed will also depend on the magnitude of the overclocking you are trying to achieve.
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a c 136 ) Power supply
March 25, 2012 10:36:30 PM

Since it's a factory OC'd card and I can only assume you are gonna crank it up some more, ..... and assuming you are gonna OC the 2500k also, I'd use a quality 850 watter.
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March 26, 2012 4:40:36 AM

@dirtyferret is that 40a total?

@JackNaylorPE Probly not going to touch the Video card seeing as how those frequencies are oc'd already. I want to stay on the safe side on that one. The CPU however I probably will overclock a good amount or at least what a Cooler Master H 212 will allow.
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Best solution

a b ) Power supply
March 26, 2012 7:53:36 PM

sonyz92 said:
@dirtyferret is that 40a total?

@JackNaylorPE Probly not going to touch the Video card seeing as how those frequencies are oc'd already. I want to stay on the safe side on that one. The CPU however I probably will overclock a good amount or at least what a Cooler Master H 212 will allow.


yes 40a on the 12v rail be it single or split

even with an OC intel i7 CPU, you won't break 400w gaming

Test System Specs
- Intel Core i7 920 (Overclocked @ 3.70GHz)
- x3 2GB G.Skill DDR3 PC3-12800 (CAS 9-9-9-24)
- Asus P6T Deluxe (Intel X58)


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March 27, 2012 1:55:03 AM

So to be on the safe side and leave room for upgrades I'm thinking 550-600W? I have a one of those clear Apevia power supplies 500W right now don't like it its really loud. I want too look for the quietest one possible.
I found this ]http://www.newegg.com/Product/Product.aspx?Item=N82E16817341017] Good enough to run OC Vid card and i5 2500k?
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a b ) Power supply
March 27, 2012 2:01:38 AM

there are a lot of good PSU in that range, just a few of the top of my head

PC Power and Cooling 600w
Antec true power new 550w
Seasonc 520w
OCZ ZT 550w

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March 27, 2012 2:14:56 AM

Thank you very much for helping me and giving me the info I needed. I've got an idea of what I need now.
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March 27, 2012 2:15:15 AM

Best answer selected by sonyz92.
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