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Windows 7: Recommended Power Supply Wattage Calculator

12 May 2011   #11
Johnathan Lyman

Windows 7 Ultimate 64-bit

Quote   Quote: Originally Posted by Tepid View Post
Actually, there are a lot more factors that go into it.
The system in my specs had a 650W. Which is also what most of these calcs recommend for my system.

My Main issue, and with just a Keyboard, Mouse and one other USB Device.......
But, change any of the USB's on the calcs to max and the results don't change much.

I had an older External HDD that did come with a Y Power USB Cable, Power+Data and Power ends
If I plugged in just with the Power+Data cable, it would work fine
But if I added an External HDD or thumb drive, it would then start clicking and stop working,
It require the other power cable.
After adding the 750W, I do not have that issue any longer.
I had that issue with an enclosure that came with a Y cable and I just swapped the cable for one that was not made in the Y fashion and all was resolved.

My System SpecsSystem Spec
12 May 2011   #12

W7 Professional x64

I don't like to put anything below 500 into a machine, just so that it's not taxed constantly. The Extreme whatsit power calculator is a good guideline I have found.
My System SpecsSystem Spec
13 May 2011   #13

7 Ultimate x64

Without fail, so called psu calculators always output a figure that's far above what an actual machine uses.

Yes, I'm guilty of having a 760 watt psu too, but that's not because I think I'll need that much juice, or because I want "headroom"... far from it... it's because the really nice psu's just don't come in wattages that are more reality based these days.

Power Consumption of Contemporary Graphics Accelerators: Spring 2010. Page 3 - X-bit labs

Very few machines use all the power they possess; in fact, I'm considering hooking up a mini-fridge and microwave to my rig!
My System SpecsSystem Spec

13 May 2011   #14

Windows 7 Ultimate x64

[QUOTE=Johnathan Lyman;1394398]To be safe, I like to take the advertised wattage and multiply it by 80% (or .8)./QUOTE]

Great. The PSUs works in their better efficiency when they are (more or less) at 50% of their charges.

So, this gives a lower energy comsumption, and room for upgrades at the same time.
My System SpecsSystem Spec
13 May 2011   #15
Microsoft MVP

Windows 7 Ultimate X64 SP1

Quote   Quote: Originally Posted by Fumz View Post
Very few machines use all the power they possess; in fact, I'm considering hooking up a mini-fridge and microwave to my rig!
Never thought of that!
My System SpecsSystem Spec
18 May 2011   #16

Windows 10 Pro. EFI boot partition, full EFI boot

I just used the Antec calculator for my box. It recommended 477 Watts. I used the Kill-A-Watt device to determine the actual power consumed running IBT and furmark together (100% load on CPU and GPU). The box used between 450 to 470 Watt. Idle or under mild load it used 350. So the Antec calculator predicted my PSU wattage pretty well.
My System SpecsSystem Spec

 Recommended Power Supply Wattage Calculator

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