How does power supply amps effect requirements (performance) of the graphics card?

By BillAllen55
Dec 21, 2008
  1. My question is this:

    The graphics card requirements suggest a
    power supply with +12 Volt current rating of 22 Amp Amps.)

    The power supply specs are showing only as high as
    18 amps. Is this going to create an issue with the power supply not being at the recommend 22 amps?

    Requirements for my graphics card are:

    Minimum of a 400 Watt power supply.
    (Minimum recommended power supply with +12 Volt current rating of 22 Amp Amps.)
    Minimum 450 Watt for SLI mode system.
    (Minimum recommended power supply with +12 Volt current rating of 24 Amp Amps.)

    Spefications of my power supply are :
    Brand Antec
    Model NeoPower 550
    Type ATX12V
    Maximum Power 550W
    Fans 1 x 80mm super-silent fan
    PFC Active
    Main Connector 20+4Pin
    +12V Rails 3
    PCI-E Connectors 2 x 6Pin
    SLI Certified
    CrossFire Ready
    Power Good Signal 100-500ms
    Hold-up Time 20ms at full load
    Efficiency Up to 85%
    115V - Full load 76%; Typical load 82%, Light load 77.9%
    230V - Full load 80%; Typical load 85%, Light load 79.45%
    Over Voltage Protection +5V trip point < +6.5V
    +3.3V trip point < +4.1V
    +12V trip point < +14.3V
    Input Voltage 100 - 240 V
    Input Frequency Range 47 - 63 Hz
    Input Current 9A @ 115V, 4.5A @ 230V
    Output +3.3V@24A, +5V@20A, +12V1@18A, +12V2@18A, +12V3@18A, -12V@0.8A, +5VSB@2.5A
    MTBF >80,000 Hours
    Approvals UL, CUL, TUV, CE, FCC, CCC, CB, C-tick
    Connectors 1 x Main connector (20+4 pin)
    2 x 12V (P4)
    6 x peripheral
    4 x SATA
    1 x Floppy
    2 x PCI-E

    I feel as if I've been a sleep for years not knowing all this stuff - would greatly appreciate any feed back regarding this as I'm planning on purchasing a graphics card soon.
    Thank you.
  2. EXCellR8

    EXCellR8 The Conservative Posts: 1,835

    Your PSU has a triple +12v rail design so you will use the combined amperage across all three rails. In this case, you have a combined rating of 54amps, which is far more than enough to run the latest video cards. The PSU is also CrossFire and SLI certified so running a single card that requires only 22amps should be a breeze for that power supply. Having an underpowered PSU may produce graphical anomalies or prevent a video card from functioning at all, just to answer your question.
  3. BillAllen55

    BillAllen55 TS Maniac Topic Starter Posts: 368

    thank you

    Thank you so much for your reply. This saves me additional researching of the issue. I could not get to the point that the 12 volt rails were working in tandem.
    I appreciate your response.
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