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  1. Joined : Jun 2015
    N.Y.
    Posts : 3,005
    Windows 10 Pro 64 bit
       09 Sep 2015 #11

    bobkn said: View Post
    Where did you get the 28A requirement? I'm not questioning the number, but I rarely see such specific recommendations for a PSU. (EVGA typically gives such a number, but they only do nVidia based cards.)

    Incidentally, looking at Computer Parts, Laptops, Electronics, and More - Newegg.com, expensive 450W PSUs are rated at 36 or 37A on the +12V rail.

    I'm not trying to be argumentative here, but I'd resist the trend of spending other people's money for them. (I'm willing to waste my own.)

    Of course, if Joyous's PSU dies in a shower of sparks, I'd accept no responsibility for that. (I'd expect that a PSU in a Xeon/X58 workstation system to not be a low-end one.)
    Found information online about needing 28amps on +12 volt rail. Yes, nvidia cards always give you the amount of amps and wattage needed, rarely AMD shows you the amount of amps needed just wattage.

    Fine 450W have that much amperage, as all PSU's list Amperage. But as seen on Guru3D and other places at least 500W or greater needed, even more if Crossfire 2 cards.

    Spending other peoples money ?? They come here for advice and this is what we give,we do not make there decisions for them this is up to them.They as we do sometimes can also look online, even when buying at place like Newegg give you the requirements of a specific hardware.
      My System SpecsSystem Spec


  2. Joined : Jul 2015
    Posts : 359
    Windows 10 Pro 64bit v10586.3
       09 Sep 2015 #12

    P/E = I for current load. Where P= Watts Max, E = Operating Voltage, I = Your load Current in Amps. Very simplistic calculation here but gives you a rough idea to plan your power supply needs.
      My System SpecsSystem Spec


  3. Joined : May 2015
    Posts : 1,377
    Win 10 14393.51
       10 Sep 2015 #13

    jds63 said: View Post
    F(snip)Fine 450W have that much amperage, as all PSU's list Amperage. But as seen on Guru3D and other places at least 500W or greater needed, even more if Crossfire 2 cards.
    (snip)
    Yes, I noticed the 500W requirement. That sort of spec annoys me. It might make someone with a good 450W PSU nervous, even though his PSU is more than adequate to drive the system at maximum load forever. Another person with a low-end 500W PSU might be misled. Example:

    Diablotek DA Series PSDA500 500W ATX Power Supply - Newegg.com

    This "500W" PSU is rated at 17A on its single +12V rail. If that is the true limit of what it can supply, that's inadequate for Joyous' system if the CPU and GPU were run at maximum load.

    I have no idea what sort of PSU "Joyous" has, but I'd be surprised if it was inferior to this "500 Watt" model. If it has a single rail that's good for more than the 28A you suggested, it ought to be OK. If it has multiple rails, that makes the estimate more difficult. (Simply summing the currents in the rails will be misleading.)

    Can you suggest a good reference for system requirements for AMD graphics cards? I generally look at eVGA for nVidia cards, as they are obliging enough to list +12V PSU requirements.
      My System SpecsSystem Spec


  4. Joined : Jun 2015
    N.Y.
    Posts : 3,005
    Windows 10 Pro 64 bit
       10 Sep 2015 #14

    bobkn said: View Post
    Yes, I noticed the 500W requirement. That sort of spec annoys me. It might make someone with a good 450W PSU nervous, even though his PSU is more than adequate to drive the system at maximum load forever. Another person with a low-end 500W PSU might be misled. Example:

    Diablotek DA Series PSDA500 500W ATX Power Supply - Newegg.com

    This "500W" PSU is rated at 17A on its single +12V rail. If that is the true limit of what it can supply, that's inadequate for Joyous' system if the CPU and GPU were run at maximum load.

    I have no idea what sort of PSU "Joyous" has, but I'd be surprised if it was inferior to this "500 Watt" model. If it has a single rail that's good for more than the 28A you suggested, it ought to be OK. If it has multiple rails, that makes the estimate more difficult. (Simply summing the currents in the rails will be misleading.)

    Can you suggest a good reference for system requirements for AMD graphics cards? I generally look at eVGA for nVidia cards, as they are obliging enough to list +12V PSU requirements.
    I see what you mean from your example, but true because a cheap model, as i never saw ones with this wattage have such lower amps. I had a Corsair once in older system 500W had 38A http://www.newegg.com/Product/Product.aspx?Item=N82E16817139027



    What i meant from my first post here was another OP was suggesting an 800W PSU i said i thought that was too much and suggested less, as 600-650W, as i was not sure if you read that correctly at first. Before buying a new Video card most will look at requirements and make sure there system specs meet those requirements and one of those important ones it adequate wattage and amps. Other requirements being CPU as we have heard of the term bottlenecking.Not sure if this CPU will work well with AMD R9 270 http://ark.intel.com/products/39718/...-GTs-Intel-QPI


    Look at mine at bottom, when see 500W requirements **** Read fine print below on that page.

    Now, me and you both for one do not know much about this system, just what the CPU is and a motherboard Model number. Best if people can fill in all there specs here as best they can, especially when it comes to hardware questions and advice.

    Always go bit above what you need for PSU to compensate for other hardware that you may have or may upgrade in future.
    Always buy Gold,Bronze, Silver Plus certified PSU.

    As said before with AMD Graphics Cards and NVIDIA Graphics Cards, AMD tends not to give enough information on requirements of power as NVIDIA Chipset cards do. As it always seems to take a lot more searching with AMD for any issues or to find out about there requirements and even this R9 270 needing 28 Amps and how correct this might be, but Guru3D is a good site.

    I seem to like EVGA for NVIDIA cards i always had luck with there cards and i also prefer NVIDIA over AMD/ATI cards.
    I have this card http://www.evga.com/products/Specs/G...1-49c3df7ed0b1

    Not sure understand last question are you asking for thread starter or yourself. Looked on AMD/ATI site was limited PSU info, but other info for system requirements.http://www.amd.com/en-us/products/graphics/desktop/r9
    Last edited by jds63; 10 Sep 2015 at 14:31.
      My System SpecsSystem Spec


  5. Joined : Jul 2014
    Serbia
    Posts : 6,968
    All kinds
       14 Sep 2015 #15

    POwer marked on PSUs is just maximum peek power for short term usage, when picking a PSU of a good make and model, always over calculate by 25% to be on sure and safe side.
      My System SpecsSystem Spec


 
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