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PCI-Express Slot power?

Discussion in 'Graphics Cards' started by newfellow, Sep 16, 2009.

  1. newfellow New Member

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    Well, I know all the GPUs nowdays uses their own 6/8-pin power connectors, but does the PCI-E slot itself give the card or generally use any power from motherboard?
  2. Mussels

    Mussels Moderprator Staff Member

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    yes. upto 75W
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  3. hat

    hat Maximum Overclocker

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    The PCI-E slot provides 75w, however when gpu's have external power connectors, the slot doesn't do much in the way of providing power.
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    Crunching for Team TPU
  4. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

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    Every pair is an additional 25w. 6-pin = 75w, for example, in addition to the 75w slot power granting a maximum power draw of 150w for the entire card.
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    Crunching for Team TPU
  5. largon New Member

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    If a PCIe card has an onboard power connector, be it 6pin or 8pin or both, then slot power is hardly used at all. Basically, those cards that have 6pin/8pin use PCIe slot power only to power the VRAM so the total draw from slot is usually 30W or so. HD4870X2 draws only about 45W from the slot.
    newfellow says thanks.
  6. jomjomjom5 New Member

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    PCI Ex 16x Slot MaxPower = 75w. 6pin or 18pin is 12V line.If that have 20A in line(You must see A(Amp) at you PSU Spec).It will have MAX Power in line is 12V * 20A = 240W per one Slot(6 or 8 pin) .If your card require power at 120w.You must use one 6pin for card.(Pci = 75w + 6pin = 0 - 240w)

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