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Molex question

B

BLACK@BLUE

Weaksauce
Joined
Feb 24, 2012
Messages
70
Hi all, I DC/WCG under CAP_USAF for this team and just had a little upgrade from 2x 8419's to 2x 8439's and just saw my 8pin molex had turned brown and was to hot to keep finger on, seems like I would have noticed this in the last year but I'm not sure, does this sound normal or not? I turned my psu off just in case till I can get some info, right now I just have a 500 watt psu and it didn't have enough connectors so I used a molex to 8 pin. I will be getting a psu that can handle this in a month or so but I'd like to run until then if I can do it without burning down the house.

Any help would be cool.
 
That's not normal. My bet is that adapter doesn't have a good contact and thus increased resistance which in turn caused the plug to get hot to the touch. I would not run it like that.

Pull the 8pin off and see if any of the pins might have been pushed out.
 
Ok, thank you for advice, took it off all pins were in fine, there are 2 rows of 4 wires, 4 black, 4 yellow, the yellow wire side of molex is what was turning brown, very slight on first 3 wires but 4th yellow wire part of the white connector was brown all the way to wire and wire itself was turning black, I moved it back and forth and it was real stiff and brittle and it broke off.

I have two setup's that are the same except the other one still has 8419's and molex looks fine, I don't know but it seems the 8439's were maybe to much for it.
 
Yah, sounds like a bad contact. Increased resistance = heat. A lot of those cheap adapters use thin wires and the connectors aren't the best.
 
If you are using an adapter/splitter , I would expect that. Does your PSU have PCIE connectors?
 
I used one of those adapters once. Ran great until I decided to unplug everything to make a few changes. After plugging everything back in... crispy critter. Those plugs sure aren't designed for what we do. Emergency use maybe, but I'm not using them again.
 
sc0tty8 said:
If you are using an adapter/splitter , I would expect that. Does your PSU have PCIE connectors?
Click to expand...

Yes it does, is there something better that I can get that connects off that that will hold me over? I really don't know much about these. I'll go check bay and see if I can find something till you get back to me, thank you.
 
Well a PCI-e connector has more than just 4 connections so you'll be less likely to run into resistance causing the heat issues which is making the connector turn colors. If you do have a PCI-e connector on the PSU then using an adapter to go from that to what you need would probably work out better than using a molex connector.
 
You can do two pcie connectors side by side into an 8 pin just make sure you know what your doing if you try that. You won't get char and there's plenyt of power on tap ;)
 
sc0tty8 said:
You can do two pcie connectors side by side into an 8 pin just make sure you know what your doing if you try that. You won't get char and there's plenyt of power on tap ;)
Click to expand...

They have to be 8 pin PCI-e connectors though right?
 
I'm looking at the motherboard side of the connection and it looks discolored too, man now I'm wondering what's going on, trying another molex connector to see if it will work till I get another psu. Wonder if laminate floors are fire resistant.
 
BLACK@BLUE said:
I'm looking at the motherboard side of the connection and it looks discolored too, man now I'm wondering what's going on, trying another molex connector to see if it will work till I get another psu. Wonder if laminate floors are fire resistant.
Click to expand...

Zoom in on the pins, the plastic isn't the portion which will introduce resistance. You might be able to clean the pins. I would take some sand paper and try to roll it tight to fit in there and see if you can get the pins to shine again.
 
If you cannot do that, get some "contact cleaner."

LOTS of ventilation, this stuff makes a lot of fumes, but it will clean electronics like nothing else.

Conctact cleaner KC, is one I have used on the job on nuclear instrumentation.

http://www.rolyinternational.com/html/KCA.html
APDLYWE00027_WB_1_PM_001.jpg
 
We'll have had it running with np for about 12 hours, not hot to the touch anymore with this back up connector but I still don't feel 100% safe, still getting another psu, looks like i'll have to jump up to a 600 - 700 watt to get all the connectors from what I've seen so far.
 
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