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1370 posts

Uber Geek


#115391 24-Mar-2013 14:41
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I have a n HP DC7800 with a dead PSU. Ive tried looking for a replacement and have come up with little to nothing as direct replacement. As its only going to sit in the garage and be used as a games machine Im wondering about just buying a PSU which can sit outside the SFF case.

My question is around a 6 pin connector it has on it. Is this for a PCI-E card ? That's what the web seems to tell me, but I have another old P4 desktop with PCI-E and that only has 4 pins. 

The original PSU is only 240W and if I put a PCI-E graphics card in it I will obviously need more, I assume any old PSu with a 6-pin connector (as well as the 20-odd pin its got) will be ok ?

Or am I missing something here ?

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687 posts

Ultimate Geek

  #792836 4-Apr-2013 01:50
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What sort of 4-pin and 6-pin are we talking about here?

Is the 4-pin like this?

It could be ATX/BTX 12v.

Is the 6-pin like this?

it could be one of several things. e.g. WTX CPU power:

Or one of these other ones:

Perhaps this page helps a little more:,3061-12.html

#include <standard.disclaimer>

1370 posts

Uber Geek


  #792981 4-Apr-2013 10:27
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Thanks for that information.

It looks like its an HP-specific connector. Its marked P3 and has three black and two brown with one yellow, which doesn't appear to be PCI-E, its a custom power plug.

Sadly I've drawn a blank finding a cheap replacement in NZ. I was just hoping I might be able to use a standard PSU but it doesnt look like, or at least I cant find any confirmation of being able to do it on the net.




22884 posts

Uber Geek

Lifetime subscriber

  #793006 4-Apr-2013 10:56
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What's your budget? Why don't you just buy another 7800 to pillage it for parts and sell the rest as parts.

1370 posts

Uber Geek


  #793046 4-Apr-2013 11:37
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Hehe, that's how I've come to this point. A friend had a dead DC7800 so I just bought another to swap the PSU's.

So I'm just trying to get this one going to see if I can use it for anything :)

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