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X1900 Amps?

Discussion in 'Graphics Cards' started by roadie, 16 May 2006.

  1. roadie


    Joined: 22 May 2003

    Posts: 2,803

    Location: Hampshire

    I saw a thread on another forum that I thought was pretty interesting. It was to do with the maximum number of amps that X1900's were drawing. You can see this info in ATI Tool, which is a great little utility, available here

    Under 2D all X1900's should draw the same(5.5A), as clocks are reduced but under 3D it can vary quite a lot depending on how much they are overclocked. Some people had theirs drawing over 30A! My XT at stock clocks only draws 19.1A but I am sure lots of people can beat this.

    Anyway, this thread is also related to concerns about my PSU. As per my sig, it's a Hiper 480W, which exceeds ATI's minimum demands and has 18A+16A on the 12V rails. However, whilst running an instance of SP2004 and ATI Tools artifact scanner or 3D view, the number of amps the card is drawing often falls from 19.1A to 5.5A. This also decreases performance. I thought that this might be a problem with the PSU but I bought a multimeter and the 12V reading when under heavy load stays at 12.23V from an idle reading of 12.37V.

    It would be great if as many X1900 owners as possible could post their Amps when just running ATI Tools 3D view and also their Amps when running ATI Tools 3D view plus an instance or two of SP2004 or S&M.

  2. fornowagain


    Joined: 3 Nov 2004

    Posts: 9,849

    Location: UK

    On my way out so can't explain in detail. You may know this already, but..

    1> You can't just add the two 12v PSU rails together to get the true amperage. You have to look for the "combined" 12v wattage and divide by 12v. Your hiper supplies 29A/350W at 12v.

    2>The high currents you see are at the GPU. And that runs at 1.4v in 3D, so the wattage is what? 30x1.4=42w as far as you PSU is concerned at 12v that's 3.5A
  3. FreeStream


    Joined: 10 Apr 2004

    Posts: 13,396

    Correct, and ATi Tool isnt something new to most of us here :D

    Just need a new version to sort 2D/3D clocks :eek: