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 Post subject: 20-Pin power supply on a 24-Pin Mobo?
PostPosted: Mon May 13, 2013 4:14 pm 
8086
8086

Joined: Sat Mar 16, 2013 12:29 am
Posts: 4
I have a little problem here..... my Delta Electronics 460 watt psu finally burnt out after about 3 years, and I have an extra older Dell 250 watt power supply laying around. Now, here is where I need help. My motherboard (GA-78LMT-S2P) has a 24-pin connector on the motherboard, but I counted the number of pins on my Dell 250 and only counted 20. Is it possible to run my pc on this little power supply? I have;

Dell Studio XPS 7100 mini tower
Windows 7 Home Premium 64-bit
1TB Seagate Barracuda 7,200rpm HDD
Gigabyte GA-78LMT-S2P AM3+ motherboard
4GB (1x4GB) 1600MHz Dual (or single?) channel DDR3 SDRAM (Corsair Vengeance)
AMD FX-4100 cpu @ 3.6GHz (3.8GHz Turbo Core)
ATI Radeon HD 3000 512MB DDR2 integrated graphics
250 watt Dell psu (from my older P4 system)* hopefully it works.

Can anybody tell me if it is possible to connect my 20-pin 250 watt power supply to my 24-pin motherboard AND have it function?


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 Post subject: Re: 20-Pin power supply on a 24-Pin Mobo?
PostPosted: Mon May 13, 2013 7:51 pm 
Team Member Top 10
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Joined: Tue Jul 13, 2004 2:55 pm
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I don't think the older dells were wired the same as the standard power supplies


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 Post subject: Re: 20-Pin power supply on a 24-Pin Mobo?
PostPosted: Mon May 13, 2013 8:46 pm 
Willamette
Willamette

Joined: Thu Aug 12, 2004 9:04 am
Posts: 1035
If the Dell PSU that you describe is from earlier than 2007, it will not work with your motherboard as it is wired for the older proprietary motherboards that Dell used in those earlier builds. Dell did not start jettisoning proprietary motherboard and PSUs until late 2006, IIRC.


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 Post subject: Re: 20-Pin power supply on a 24-Pin Mobo?
PostPosted: Tue May 14, 2013 12:43 am 
8086
8086

Joined: Sat Mar 16, 2013 12:29 am
Posts: 4
The 250 watt psu itself is from 2005, and I can pretty much say it actually works. I had it run for about 12 hours straight, and it did fine. It'll have to do for now until my new psu gets here. Thanks anyways guys.


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 Post subject: Re: 20-Pin power supply on a 24-Pin Mobo?
PostPosted: Tue May 14, 2013 7:32 am 
Willamette
Willamette

Joined: Thu Aug 12, 2004 9:04 am
Posts: 1035
When I said that the PSU would not work with your motherboard, what I really meant was that, due to the wiring difference(s) in the Dell PSU as opposed to a "standard" PSU, you are running the risk of ruining the Gigabyte motherboard that you have. It may appear to work in the meantime, but there is a chance (and a fairly good one) that it may shorten the lifetime of the motherboard itself, if not ruin it altogether. Good luck!


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 Post subject: Re: 20-Pin power supply on a 24-Pin Mobo?
PostPosted: Tue May 14, 2013 9:04 am 
Clawhammer
Clawhammer

Joined: Sun Jun 18, 2006 7:37 pm
Posts: 4534
The four pins are an extra +12V, +5V, +3.3V, and ground. If your system is not drawing a lot of power, there is no need to concern yourself. And a lot of smaller motherboards only use the 20 pin variety.

Hell, plug it in and see if it works as is.


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