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I am going to be bulding my own PC. I am going to put 32gb ram, a 3.5ghz i7 with a 128 sdd and a 1tb hdd. No graphics just the one built in. I will have 2 cd drives on it. What size power supply will I need to run all this and possibly a little more because I may upgrade in future. Thinking about getting a 750 watt. Just Leave a link below to one that would fit my needs. Thanks!

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asked Jan 01 '13 at 21:41

Joe%20Fullington's gravatar image

Joe Fullington

Seems rather wasteful to get an i7 when on what I would assume to be dedicated graphics, especially when the benefit over the i5 is minimal and sometimes non-existent. Curious as to what you need that ridiculous amount of RAM for also.

That aside searching online for PSU calculator, or Power Supply Calculator will typically yield tools where you can select what hardware you have and it will provide such suggestions.

Using one calculator, and a few assumptions of my own a figure of 249 watts came up.

If you really are not going to be adding a dedicated GPU then a 450/550w supply will be plenty.

However should that simply be a later option then that needs will only be in part about the wattage but more about its supply requirements in terms of the cables.

Dedicated Graphics Cards nowadays do not get sufficient power from the motherboard alone and need an additional supply from one or more PCI-E cables from the PSU.

Those come in two sizes, 6 and 8 pin varieties and can vary in the numbers required.

You may require between one or three of those for a single card, and more for SLI/Crossfire.

Someone more experienced might be able to provide better advice on brands, which given my prior need to have only replaced one PSU I am ill equipped to provide.

answered Jan 01 '13 at 22:29

EnvoyOfTheEnd's gravatar image


I think a 500 watts Power supply unit should be enough

answered Jan 02 '13 at 11:05

Tony's gravatar image


If you have no plans of getting a dedicated card than for those specs, you can easily get by with a 350 watt power supply. (which is pretty standard for core i7 systems with onboard video.)

If you plan to go with a dedicated low power card (eg if you need additional hardware acceleration bot no serious gaming, then 400 watt+ is good.

With the pricing of power supplies as they are now, it is best to just get a 600-750 watt power supply as the pricing is close and a power supply will only pull as much power as the system wants. The ATX standards also does not change often so that 1 power supply will last you probably your next 5-6 computer builds.

answered Jan 02 '13 at 17:25

Razor512's gravatar image


As noted in mine the graphics card is the one component most prone to change in its requirements.

So perhaps getting a PSU with 2x 6+2 Pin PCI-E cables would offer such room to breath.

(Jan 02 '13 at 18:58) EnvoyOfTheEnd EnvoyOfTheEnd's gravatar image
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Asked: Jan 01 '13 at 21:41

Seen: 542 times

Last updated: Jan 02 '13 at 18:58