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Thread: Can I connect a 6-pin PCIe instead of 8-pin PCIe?

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    Default Can I connect a 6-pin PCIe instead of 8-pin PCIe?

    I've purchased a Corsair HX620 PSU two days ago (I had intended to get the VX550, but unfortunately only the VX450 seems available here in India).

    The PSU has two PCIe 6 pin connectors, however it doesn't have the 8 pin connector for PCIe 2.0.

    The 6 pin connecter is supposed to deliver 75W as per the PCIe specs, and the PCIe 2.0 spec calls the 8 pin connectors to supply 150W.

    I believe that my PSU is capable of supplying 150W on the 6 pin rail.

    Most video cards seem to bundle a Molex to 8 pin PCIe coverter, but I'd like to know if it would be possible to power a card from a PCIe 6 pin connector?

    I have seen websites claiming it should be possible. Has anyone here actually tried this?

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    Your card probably doesn't NEED 150W via the PCI-e connector. The connector can typically deliver UP TO because the extra two wires are a +12V Sense and Ground that "tell" the PSU when the +12V drops out of spec. The PSU can "crank up" the +12V in order to compensate for this.

    In most, if not all, PSU's today the extra two wires are just ground, which "tricks" the graphics card into thinking the +12V sense is present, allowing certain overclocking functions.

    You can just take your existing 6-pin PCI-e connector and plug it into 6 of the 8 pins of the 8-pin connector. It will fit like a glove and work perfectly.

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    Wow.. That was a quick and informative response.

    Thanks

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    Probably it's an ATI card. If you plan to OC it with 2x6 pin PCI-E connector do it via RivaTuner because CCC won't let you if you don't have a 8 pin PCI-E connector.
    Otherwise no problems.

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    @burebista
    I'm using a 8600GT right now (It doesnt require any external power), but i was thinking of getting a 8800GT sometime later.

    But thanks for the info. I'll keep this in mind if i go with an ATI card

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    8800GT requires 6 pin PCI-E connector. So, no worries.

    Below is mine with AC Accelero S1 fanless.
    Last edited by burebista; 12-11-2007 at 04:37 AM. Reason: Typo

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    Right. You won't need an 8-pin unless you're going with an ATI R600-series card or an Nvidia D9P card.

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