convert older 20 pin PSU to newer 20+4

December 21, 2010 at 19:40:16
Specs: Windows 7
hey all - working on a new PC build and looking to re use an older PSU i have laying around. thing is the board im hooking it up to is a 20+4 and i need that extra adaption. i've seen mods like this done before and was wondering if any one has a link to said mod? or is there a molex converter around some where? idealistically not shelling out any more cash is preferable seeing as i have a 4 pin connector in my bin of parts.

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#1
December 21, 2010 at 20:37:18
You need to consider the power consumption needs of the new board, not just the required connectors. It is doubtful your old ATX powersupply will be up to the task.

What motherboard are you planning to use and what do you plan to run on it?
IE CPU, Ram, Drives, Graphics, etc
What are the amp ratings on each rail of your powersupply and what is the overall wattage rating?

You might want to read this:
http://www.smps.us/20-to-24pin-atx....

Goin' Fishin' (Some day)


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#2
December 21, 2010 at 20:48:51
well the psu i have is a 300w, the board is a Zotac 6100 GF e-e, using a 2.2gig Sempron at 65w TDP so if my math is right the psu will output as much as the board needs.

that link did clear a few things up for me, thank you.


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#3
December 21, 2010 at 21:17:13
If you go ahead and use the old power supply, here's an adapter:

http://cgi.ebay.com/6-Power-Supply-...

or

http://cgi.ebay.com/20-p-24-pins-AT...

Real men don't use AntiVirus; they just reformat


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#4
December 24, 2010 at 12:43:04
thanks for the help guys - i was able to learn from looking at the pinouts for a 20 pin powersupply and the 20+4 (NOT 24 pin - it has a seperate 12v rail that goes to a completely different part of the machine) that it is possible to use the older PSU without buring it out.

i took a seperat 12v 4 pin connection from a dead PSU ran the 2 yellow lines to the inside of a yellow 12v line inside an IDE connector, then did the same with the grounding lines - it works just fine and have had no problems.


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#5
December 24, 2010 at 17:48:34
If it works then I guess it's OK. The extra 4 wires on the 24-pin connector are not the same voltage as the separate 4-pin ATX connector. But it could be that using a 20-pin connector AND the separate ATX connector are just as good as using a 24-pin. I'm not really sure how that works out.

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