Power Supply Sizing/Selection

Phosphonothioic

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Dec 20, 2012
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Without doing the nitty-gritty math, let's say my system needs 650W. There are some specials going on that are pretty good for full-modular PSUs.

Should I get the more expensive 750W:EVGA 750W

Or the 850W: EVGA 850W

Does oversizing the PSU lead to problems?

Thanks!
 
Solution
I have no problem overprovisioning a PSU a bit. Say 20%.
It will run cooler, quieter, and more efficiently in the middle third of it's range.
A PSU will only use the wattage demanded of it, regardless of it's max capability.
The only negative to a very oversized psu will be less efficient operation.

As to a recommended wattage, here is a handy chart:
http://www.realhardtechx.com/index_archivos/Page362.htm
Pick a tier 1 or 2 unit from this chart:
https://community.newegg.com/eggxpert/computer_hardware/f/135081/t/45344.aspx?Redirected=true

Phosphonothioic

Distinguished
Dec 20, 2012
159
1
18,685


[strike]The 850W is cheaper.[/strike] ;)

EDIT: Maybe not...neglected shipping.
 
I have no problem overprovisioning a PSU a bit. Say 20%.
It will run cooler, quieter, and more efficiently in the middle third of it's range.
A PSU will only use the wattage demanded of it, regardless of it's max capability.
The only negative to a very oversized psu will be less efficient operation.

As to a recommended wattage, here is a handy chart:
http://www.realhardtechx.com/index_archivos/Page362.htm
Pick a tier 1 or 2 unit from this chart:
https://community.newegg.com/eggxpert/computer_hardware/f/135081/t/45344.aspx?Redirected=true
 
Solution

Phosphonothioic

Distinguished
Dec 20, 2012
159
1
18,685


So, I don't have to worry about heat issues...it will only draw what it needs. Gotcha.