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20 4 pin power supply 24 pin motherboard

Last response: in Components
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May 11, 2012 8:48:40 AM

Hello,
i have a 20pin power supply so how can i convert 20pin to 24pin power supply?
May 11, 2012 9:02:18 AM

seems the safest way is this: APEVIA Model CVT2024 20 pin to 24 pin ATX Cable 5 bucks on newegg
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a c 128 ) Power supply
a c 151 V Motherboard
May 11, 2012 1:04:48 PM

This link shows how to use a 20 pin PSU on a 24 pin board along with how to use a 4 pin on an 8 pin mobo connection and explains why it works.
http://www.playtool.com/pages/psuconnectors/connectors....
I found it to be very interesting reading but you can just scroll down to the 20 and 24 pin section and the 4 and 8 pin sections
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a c 144 ) Power supply
a c 156 V Motherboard
May 11, 2012 2:38:35 PM

The cable adapters are useless. The 4 extra wires will not help the PSU provide more current than with the 20 pin cable.

And there's a very good chance that your old power supply will not work. The old PSU's are designed with relatively heavy heavy 3.3 and 5 volt rails and a relatively light 12 volt rail. This is just the opposite of what a modern PC needs.
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a c 128 ) Power supply
a c 151 V Motherboard
May 11, 2012 2:53:53 PM

jsc said:
The cable adapters are useless. The 4 extra wires will not help the PSU provide more current than with the 20 pin cable.

And there's a very good chance that your old power supply will not work. The old PSU's are designed with relatively heavy heavy 3.3 and 5 volt rails and a relatively light 12 volt rail. This is just the opposite of what a modern PC needs.


Yep, re-reading that article made me remember the warnings;
"... you can plug a 20 pin cable into a 24 pin motherboard and it will work just fine. At least, it will for a while. They added those extra 4 pins for a reason. When you plug a 20 pin cable into a 24 pin connector you're not providing the extra current carrying capacity which may be needed by the motherboard. If your motherboard's current requirements are low enough then it will work properly with only a 20 pin power cabled plugged in. But if the motherboard draws enough current, then you can overheat the 20 pins you're using on the 24 pin connector. I've seen enough pictures of burned ATX main connectors to assure you that this happens. In adding the extra four pins, 3.3 volts went from 3 to 4 lines. 5 volts when from 4 to 5 lines. 12 volts went from 1 to 2 lines so its capacity doubled. Connectors really do get hot if you overload them so the safest thing to do is use a real 24 pin power supply on a motherboard with a 24 pin connector."
Same with the 4 instead of 8 pin cpu power

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