How To Calculate Power Supply Needs

[ad]Dear Computer Lady,

This is My PC

Intel Core i5-2400 3.1 GHz
8GB RAM Crosair Vengence
ATI HD 5750 1GB x2 Crossfire
Motherboard MSI-P67A-GD65
3x Seagate Baracuda SATA HDD
1 DVD ROM Drive
Thermal take Spin-Q VT
All in Cooler Master HAF 922

I want to know which power supply will work on it?
some say 650W, some say 700W Minimum!

I need your help, Ahmad

Dear Ahmad,

There is no, “one size fits all” answer for this question. It depends on your budget, what you plan on using the computer for, how many cooling fans in your case, how many USB devices will be attached, and how much of a buffer you are going to be happy with. I would suggest that you use one of the online power supply calculators. Here are a few:

1. Cooler Master Power Supply Calculator:

2. eXtreme Power Supply Calculator:

3. Power Supply

4. MSI Power Supply Calculator:



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Elizabeth Boston is a Web designer, Social Media Consultant and managing editor of, “Ask The Computer Lady”.
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