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PSU needed for radeon 5850

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June 9, 2010 4:49:14 AM

I read that it is recommended that this GPU have a minimum 500w power supply with 12v rail supplying 40amps.

Does that mean a single 12v rail needs to provide the 40amps or could a psu with 2 12V rails @ 25 amps each work ????

i'm confused with the whole single rail vs multi rail thing

More about : psu needed radeon 5850

a c 91 ) Power supply
June 9, 2010 5:27:30 AM

Just check out the tested/supported power supplies for the 5850 in the ati website.. You'll come to know how many are single rail and how many multi rails.. Check out their specs to resolve your confusion..
a b ) Power supply
June 9, 2010 6:24:07 AM

For multiple rail PSU's you will have to find out the combined output for the 12volt rail. You will find this info on the sticker on the side of the unit or on the manufactures website under specs. It will usually give you the combined output in watts and to convert watts into amps just divide it by 12 so if it says combined output is 480 watts that would equal 40 amps. You will notice on power supplies with multiple rails will not output the total of all the rails it will be less so be careful when looking at power supplies there are a lot of cheap units that will not supply its rated power.

A few names of trusted PSU's Corsair, SeaSonic, Antec are just a few.



There has been some controversy over which is better multiple rail or single rail units, but if the unit is a quality unit it does not matter as long as it can supply the power safely and efficiently thats all that matters in the long run.

My Recommendation

Antec TruePower New TP-550
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CORSAIR CMPSU-550VX
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Its always good practice to go a little over when it comes to the power supply for two reasons.
  • 1 It will give you headroom for future upgrades and overclocking
  • 2 A power supply that is rated for higher wattage then you need will not have to work as hard so that means less heat and better efficiency.
    Related resources
    a c 243 ) Power supply
    June 9, 2010 11:09:50 AM

    saulty said:


    i'm confused with the whole single rail vs multi rail thing

    Read this
    Single vs. Multiple Rails

    Either of SAAIELLO's reccomendations would do.
    October 1, 2010 1:46:38 PM

    I am running rig 2 in my public profile with an Antec TPII 550 running an AMD 965BEC3 o/c to 3800 4 gigs DDR3, Radeon 5850 with BIOS mod to 765/1125 and it is perfectly solid. Ran Furmark stability test for over 2 hrs without a hitch.
    October 2, 2010 1:23:58 AM

    very good power supply ===> xfx black edition 750w
    with that one ur crossfire ready and u have a lot of power left... it is modular, single rail, and 80 silver ( but it almost reaches gold)
    a c 275 ) Power supply
    October 2, 2010 3:01:16 PM

    I like to recommend modular psu's for upgrades.
    You might as well imo easier install and less cable clutter.
    Antec TP,Corsair HX,Seasonic M series,or XFX are all excellent units.

    October 2, 2010 3:55:07 PM

    saulty said:
    I read that it is recommended that this GPU have a minimum 500w power supply with 12v rail supplying 40amps.

    Does that mean a single 12v rail needs to provide the 40amps or could a psu with 2 12V rails @ 25 amps each work ????

    i'm confused with the whole single rail vs multi rail thing


    Here is something that may actually help you:
    http://extreme.outervision.com/psucalculatorlite.jsp
    October 3, 2010 3:38:51 PM

    A 1st class brand 550 PSU will do the job just fine (seasonic, corsair, cooler master, Antec, SIlverstone). From less reputable brands like CoolMax, Rosewill, Sigma etc, I would go with 650Watt min. I would honestly not go bellow that mark for quality.

    Also look for 80+ certified as a minimum, not only are these PSU more efficient, they use higher quality parts.
    a b ) Power supply
    October 4, 2010 5:40:02 AM

    I have a Seasonic S12 550w powering the system in my sig below (which includes the HD 5850). I have 2 optical drives and 4 HDDs in my system.
    a b ) Power supply
    October 4, 2010 3:27:27 PM

    An ATI 5850 will need no more than 160W at full load, so a quality 500W PSU with two PCIe connectors is a good choice.

    Here you have some good options:

    Seasonic S12II-Bronze 520W
    http://www.realhardtechx.com/index_archivos/Page678.htm

    ANTEC TruePower New 550W (by Seasonic) (modular)
    http://www.realhardtechx.com/index_archivos/Page673.htm

    COOLER MASTER Silent Pro M 600W (by Enhance) (modular)
    http://www.realhardtechx.com/index_archivos/Page364.htm

    CORSAIR VX550 550W (by CWT)
    http://www.realhardtechx.com/index_archivos/Page447.htm

    ENERMAX LibertyEco 500W (modular)
    http://www.realhardtechx.com/index_archivos/Page567.htm
    a c 248 ) Power supply
    October 4, 2010 4:39:11 PM

    Here are the official power requirements for the new ATI Radeon HD 5850 and HD 5870 video cards.


    ATI Radeon™ HD5850 System Requirements:

    PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard

    500 Watt or greater power supply with two 75 watt, 6-pin, PCI Express® power connectors.

    600 Watt or greater power supply with four 75 watt, 6-pin, PCI Express® power connectors for ATI CrossFireX™ technology in dual mode.


    ATI Radeon™ HD5870 System Requirements:

    PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard.

    500 Watt or greater power supply with two, 75 watt, 6-pin, PCI Express® power connectors.

    600 Watt or greater power supply with four, 75 watt, 6-pin, PCI Express® connectors for ATI CrossFireX™ technology in dual mode.

    The power supply recommendations are for an entire pc system.

    Corsair and Seasonic are two brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty (in the USA).
    !