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I think my pc PSU is way too much

Last response: in Systems
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September 6, 2013 8:11:06 AM

Hello.

I have a gaming pc but i think the PSU is way too much in terms of wattage.

can someone recommend me another PSU or a correct wattage?

My specs:

RAM 2 x 8gb ddr3

CPU i5 3570k

GTX 680 MSI 4GB

Intel SSD 330 series

Simple 1TB hard drive

Custom Cpu cooler Cooler Master T4

MOBO MSI Military Class 3

PC Antec Dark fleet D85 Case has 7 fans and 6 usb port 2 of them usb 3.0

PSU 1200W

More about : psu

September 6, 2013 8:14:08 AM

AHHA... Yes... 1200W is so much. For that setup with no future SLI, 650W is a safe and more than adequate power.
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a b ) Power supply
September 6, 2013 8:22:45 AM

Have you already built using those components, or are you planning to build?

A psu cannot be "too much" as the system will draw only what it needs. However, if you are looking to spend less $ to build using the above parts, a solid (corsair, xfx, seasonic, antec) psu will be fine. As a note: unless you are gaming above 1920x1080 (1080p), you really don't need a 4gb gpu, nor do you need more than 2x4gb ram.

Mark
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September 6, 2013 8:27:07 AM

^ If you have the 1200W just take care of it
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a c 137 ) Power supply
September 6, 2013 8:34:14 AM

The only real negative to a highly overprovisioned PSU is lower efficiency. A PSU operates most efficiently in the middle third of it's range.
Your 1200w psu will be loafing.
But, regardless of the max capability, it will draw only the power it actually needs.

If you already have it, keep it.
If this is a prospective build, a 650w psu can handle most any single graphics card.

For a new build, I would not go with last gen parts.
Look at a 4670K, a GTX770 and a Z87 based motherboard. No value in an expensive motherboard.
Intel 330 is old tech, look at Samsung evo.
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September 6, 2013 8:36:27 AM

So a 650W PSU may be sufficient and the PC is already build.

The problem is with the 1200w PSU our electricity consumption has skyrocketed at home.

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a b ) Power supply
September 6, 2013 8:40:44 AM

There's no such thing as a PSU that's too big. Your system will draw what current it requires from whatever it's plugged into. What you get with an oversize PSU is headroom and understressed components. Using a PSU that's "just big enough" is like driving your car in first gear all the time. Yes, it will work but will surely fail sooner than if you changed gears into high. Any PSU running at 50% of rated wattage will outlast any PSU running near !00% of rated capacity assuming similar quality levels. It makes no sense for you to buy a smaller PSU. Enjoy the knowledge that you will always have sufficient power.
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September 6, 2013 8:43:18 AM

So take for example i need 800w to power my pc the other 400w is never used and i dont lose electricity?
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a c 137 ) Power supply
September 6, 2013 8:47:48 AM

You actually need only a 500w psu to power your pc. Most of that is used for the GTX680.
It will actually draw much less normally, only needing 500w while playing graphics intensive games.
The other parts take minimal power.

To save electricity, use sleep to ram(s3) when not in use. The power draw will be minimal, and the sleep/resume process will be only a few seconds.
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a b ) Power supply
September 6, 2013 1:09:14 PM

Samir Jonckheere said:
So take for example i need 800w to power my pc the other 400w is never used and i dont lose electricity?


Efficiencies vary slightly with load but your example is essentially correct. The load determines how much current (wattage) is being consumed. You are not paying for 400 Watts that isn't being used.
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a b ) Power supply
September 6, 2013 1:13:18 PM

Samir Jonckheere said:
so i should keep my 1200W PSU?


You didn't mention what brand it is which might factor into some opinions however IMHO everyone should have an oversize PSU. Personally, I try to never load my PSUs past 50% of rated wattage. Consider it an insurance policy and an inexpensive one at that.
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