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How big of a PSU?

Forum CPU & Components : Power Supplies, PC Cases & Case Mods - How big of a PSU?

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madswimmer   11-01-2009 at 09:07:11 PM

How big of a psu do i need? ill have 2 5770's(600w) Phenom II 955 (125w) 1-2 hdd's and 4gb of ddr3 1333
what else would play apart? and how much wattage do i neeed

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Upendra09   11-01-2009 at 09:11:29 PM

i would get 700 - 750 watt PSU for that

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JackNaylorPE   11-01-2009 at 10:34:36 PM

Use a PSU Calculator. I ahev this one bookmarked but there's plenty out there.

http://www.antec.outervision.com/

------------------------------ If a man speaks in the forest and no woman hears him, is he still wrong ?
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Bronze CPUs badge hunter315   11-01-2009 at 10:54:48 PM

http://www.tomshardware.com/review [...] 46-15.html
As you can see there they draw slightly more than a 4890 which can be safely run on a good 550 watt PSU, a good 600 or 650 would be plenty but a good 750 provides you the option of upgrading to a pair of stronger cards in the future.

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Silver CPUs badge JohnnyLucky   11-02-2009 at 12:07:39 AM

The official ATI recommendation for a system with two AT Radeon HD 5770 video cards operating of Crossfire mode is a 600 watt power supply with a total of 40 amps on the 12 volt rail(s).

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madswimmer   11-02-2009 at 12:41:30 AM

i think ill go with a 750w, thanks guys

Reply to madswimmer
geofelt   11-02-2009 at 01:57:42 AM

madswimmer wrote :

How big of a psu do i need? ill have 2 5770's(600w) Phenom II 955 (125w) 1-2 hdd's and 4gb of ddr3 1333
what else would play apart? and how much wattage do i neeed



The 5770 is relatively efficient. Here is a link to AMD's requirements:
http://www.amd.com/us/products/des [...] ments.aspx
600w and two 6-pin pcie connectors for crossfire.

Do get a quality unut only.
My short list of quality units would include Corsair, Seasonic, PC P&C, and Antec.

Not much else plays a part unless you have a number of unusual additional parts to a basic PC.

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