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Thread: 20 pin PSU with 24 pin mobo?

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    20 pin PSU with 24 pin mobo?

    I recently upgraded my HTPC and had forgotten about the whole 20 pin --> 24 pin change a while back. Is it worth swapping out the PSU or buying a cheap converter? My new mobo works with my old 20 pin PSU and is rock solid at default clocks but won't overclock well at all (not that I need to overclock my HTPC but hey, old habits die hard). I know that the mobo in question (P5B-VM) doesn't overclock well (supposed 300MHz FSB wall) but I struggle to keep it stable @ 250MHz and it won't post @ 266 at all regardless of any voltage or other BIOS changes. I doubt it's the chip (E2140) or the cooling (the cores stay < 40c at full load if you believe speed fan, < 55c if you believe the latest version of core temp) and it could well just be a crap board / BIOS... So... Is a new PSU / adapter worth a try or shall I just shut up and put up?

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    HEXUS.social member Agent's Avatar
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    Re: 20 pin PSU with 24 pin mobo?

    You didn't say what your PSU is
    Many older ones will work just as well as a new one with a simple 20-24pin adaptor. It really just depends on if its a decent one or not
    Quote Originally Posted by Saracen View Post
    And by trying to force me to like small pants, they've alienated me.

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    bored out of my tiny mind malfunction's Avatar
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    • malfunction's system
      • Motherboard:
      • Gigabyte G1.Sniper (with daft heatsinks and annoying Killer NIC)
      • CPU:
      • Xeon X5670 (6 core LGA 1366) @ 4.4GHz
      • Memory:
      • 48GB DDR3 1600 (6 * 8GB)
      • Storage:
      • 1TB 840 Evo + 1TB 850 Evo
      • Graphics card(s):
      • 290X
      • PSU:
      • Antec True Power New 750W
      • Case:
      • Cooltek W2
      • Operating System:
      • Windows 10
      • Monitor(s):
      • Dell U2715H

    Re: 20 pin PSU with 24 pin mobo?

    Quote Originally Posted by Agent View Post
    You didn't say what your PSU is
    Many older ones will work just as well as a new one with a simple 20-24pin adaptor. It really just depends on if its a decent one or not
    Indeed I didn't. It's an FSP 400W jobbie that's powering the mentioned chip and mobo as well as an X800XL (plus 2 HDDs, 2 DVDRWs, 2GB RAM and a couple of fans). The exhaust out of the PSU is barely warm (and the box has been XviD encoding for 3 days now) so I think the PSU is man enough - just wondering if the power supplied over the 'extra' (missing) pins is being missed by the mobo.

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    Not mad just max with a long beard Mad-Max's Avatar
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    Re: 20 pin PSU with 24 pin mobo?

    You can buy a 20 to 24 pin connector which will be the easiest way to get it working.

    You can get the following

    http://www.scan.co.uk/Products/Produ...oductID=616034

    http://www.scan.co.uk/Products/Produ...oductID=557926

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    bored out of my tiny mind malfunction's Avatar
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    • malfunction's system
      • Motherboard:
      • Gigabyte G1.Sniper (with daft heatsinks and annoying Killer NIC)
      • CPU:
      • Xeon X5670 (6 core LGA 1366) @ 4.4GHz
      • Memory:
      • 48GB DDR3 1600 (6 * 8GB)
      • Storage:
      • 1TB 840 Evo + 1TB 850 Evo
      • Graphics card(s):
      • 290X
      • PSU:
      • Antec True Power New 750W
      • Case:
      • Cooltek W2
      • Operating System:
      • Windows 10
      • Monitor(s):
      • Dell U2715H

    Re: 20 pin PSU with 24 pin mobo?

    The PSU and mobo work fine together already - I'm just wondering if it would work (overclock) better if the extra (missing) pins were connected as well

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