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Thread: Quick question

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    Bows out! CAT-THE-FIFTH's Avatar
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    Quick question

    I need to get a molex to 6pin PCI-E power converter but I have noticed that there are two types!!

    One uses a single molex connector and the other a pair - what is the best one to choose??

    The graphics card I am using is an HD3870 512MB GDDR4.


    Those despicable Elk,stealing the pond weed!

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    Big, Mean and Ugly! circuitmonkey's Avatar
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    Re: Quick question

    I've collected a fair few over the years, send me a PM with your address and i'll be happy to throw one in the post for you, this goes for anyone else too

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    root Member DanceswithUnix's Avatar
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    Re: Quick question

    I think I would generally choose the Molex pair.

    A hard drive Molex pinout has one pin with 12V on it, one 5V, and two 0V connections.
    The PCIe connector has two pins for 12V, and three 0V connections (+one unused).

    So using a pair of Molex connections gets you two 12V pins from the PSU to drive two pins on the PCIe connector.

    Couple that with the fact that Molex connectors are a bit rubbish, and using a pair of them just seems a good idea.

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    Re: Quick question

    I guess it depends if you want to spread the load of the card across 2 rails or not ?

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    Re: Quick question

    I once got one from somewhere that I think was wired incorrectly - a 2 molex to 6 pin pci-e. My PSU at the time would just cut out if it was plugged in. It worked with one molex though.

    I'm sure whether you actually need 2 molexes connected depends on how much juice your graphics card actually draws.

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