Jump to content
Floatplane payments are migrating! Read more... ×
Phishing Emails - Fake Giveaway Read more... ×
Search In
  • More options...
Find results that contain...
Find results in...

Burnt PSU/Motherboard CPU power connector

Recommended Posts

Posted · Original PosterOP

Hello guys, i'm in a bit of trouble and would like some help, please.

I was running a xeon x3440 3.6ghz O.C (1.25 on core) on a P7P55 LX motherboard with a 350 watt power supply (yes, i know)

It was running quite fine for quite long untill i started playing asssassins creed odyssey a couple of days ago (which stressed the CPU to 80-90% most of the time) 

After a few fun days of enjoying the game, pc started to randomly restart.
I dissassembled everything and reassembled it.

I came across the culprit, a burnt PSU cable for the 4 PIN CPU power connector. I assume the power draw was too much for the PSU cable or the 4 Pin CPU connector and it just burnt. This is what it looks like



The PC is working fine as far as i can see (RAM is fine, GPU fine, CPU fine and the pc boots up)

Now, i understand i need to buy a new/better PSU, but the question is, is that motherboard connector fine? (The pc does boot up even with the burnt psu) I mean if i try cleanning it out, won't it work fine with a new PSU again? 
How do i prevent this from happening again? As mentioned, my motherboards has only a signle 4 pin cpu power connector, are there any adapters to make it 8 pin to give the CPU more power and prevent the overload of that 4 pin?

I understand that buying a new motherboard with a new cpu/RAM is nice and all, but obviously, the money is tight.

Link to post
Share on other sites
5 minutes ago, Erm said:

motherboard connector fine?

You've burned the connection. Any attempt to further use it might result in a real fire.

I wouldn't use that mobo ever again.

So rise up, all ye lost ones, as one, we'll claw the clouds

Link to post
Share on other sites
9 minutes ago, Erm said:

That didn't help a lot :/

I'm trying to give you an honest answer about what might happen if you started using damaged equipment again.

Would you prefer I lie to you, tell you everything will be a-ok?


If you're really good with a soldering iron, pull out the board, unsolder the 4-pin CPU connector, replace it with a new one, and get a proper 600watt power supply.

So rise up, all ye lost ones, as one, we'll claw the clouds

Link to post
Share on other sites
Posted · Original PosterOP

Any idea where to get a replacement for the 4 pin om the motherboard? Any ebay links that come to mind?


Thank you

Link to post
Share on other sites

The motherboard connector is Mini-Fit Jr. series from Molex , or alternatives from other makers.


Here's the one that I think it's the right one: https://www.digikey.com/product-detail/en/molex-llc/0039281043/WM3801-ND/61400

And this is probably the same, just different factory code, or made at other factory, or newer batch etc etc : https://www.digikey.com/product-detail/en/molex-llc/0039288040/WM23801-ND/930297

or this one, same story, not sure why it's more expensive, probably they stocked them at different times: https://www.digikey.com/product-detail/en/molex-llc/0039296048/WM23821-ND/930309



Anyway, worst case scenario you could just buy a faulty board from eBay, or you could just solder 4 wires.


As for the connector on the power supply, easiest would be to buy a ready made extension cable, from a 8 pin EPS to 2 x 4pin ATX 12v, and cut the wires and solder them to your power supply.

It's cheaper, as you don't need to buy a crimping tools and the housing and the female pins separately to create your connector.

There's ready made cables available but they're kinda expensive, see here: https://www.digikey.com/product-detail/en/molex-llc/0451350401/WM16573-ND/6822666


Here's commercially available connector, ready made, just cut wires and solder them and put some heatshrink optionally : https://www.newegg.com/Product/Product.aspx?Item=N82E16812423184


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now