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Check Your 4090's 12vhpwr Connectors To Make Sure They are in Pristine Condition

Do we know yet whether the CableMod right-angle adapter will be a "short" one that connects to your exiting 8-pin cables (like the Nvidia-supplied adapter) or a "long" one that goes right to the PSU like the Corsair one?
 
Rogueywon said:
Do we know yet whether the CableMod right-angle adapter will be a "short" one that connects to your exiting 8-pin cables (like the Nvidia-supplied adapter) or a "long" one that goes right to the PSU like the Corsair one?
Click to expand...

They haven't said but it's highly likely to be a proper 60cm cable
 
Chud_Jenny said:
And a guy that actually knows what he's talking about!
"rambling about the 12VHPWR failures"
youtu.be

rambling about the 12VHPWR failures

EDIT: I'm a failed compsci student not a electrician or electrical engineer. This video may have mistakes in it.Sources:12VHPWR connector spec: https://cdn.a...
youtu.be youtu.be
Click to expand...

He does raise a good question - if the solder points are the problem like Igor says they are and they are causing wires to break off then 1) why are connectors melting at the end of the connector and not at the solder point and 2) why have several YouTubers now tested cutting off the wires on the side to force 600w through half as many wires and yet still couldn't not get the connector to meltn
 
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I haven't watched any of the new videos but for the connector to melt it's got to be arcing due to poor contact on the pins, don't think the plastic is going to just overheat and burn without arcing?
 
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Even though it is 12v DC with ~ 50 amps at 600 watts?

How else could the plastic get hot enough to melt without some kind of spark?
 
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^JP^ said:
Even though it is 12v DC with ~ 50 amps at 600 watts?

How else could the plastic get hot enough to melt without some kind of spark?
Click to expand...
current + resistance generate heat. ever try to touch a resistor or a wire thats drawing high current - or think how most heating elements in toaster/kettle/hair dryer work.

arcing is a result of voltage differential and plasmarisation (not sure if this is the right work) of air and making the air conductive and thus allowing discharge of build up charges. different thing to heat generated by electricial curren
 
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^JP^ said:
Even though it is 12v DC with ~ 50 amps at 600 watts?

How else could the plastic get hot enough to melt without some kind of spark?
Click to expand...
Well you'd need to get up to something like 500V DC to jump an air gap that's smaller than a human hair, so no.
 
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pc-guy said:
current + resistance generate heat. ever try to touch a resistor or a wire thats drawing high current - or think how most heating elements in toaster/kettle/hair dryer work.

arcing is a result of voltage and plasmarisation (not sure if this is the right work) of air and making the air conductive and thus allowing discharge of build up charges. different thing to heat generated by electricial current.
Click to expand...

Ah ok got it, so what would cause resistance in the connector?
 
^JP^ said:
Ah ok got it, so what would cause resistance in the connector?
Click to expand...
Look at the image in post #87. It shows how it could be caused by the plug not sitting straight in the socket.

Someone with a multimeter needs to shove 10A through one of these connectors and measure the voltage drop across the contacts, then pull the cable sideways and measure again to see how much the contact resistance actually changes.
 
^JP^ said:
Fair enough, didn't know that, was just imagining jump leads on a car battery.
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That would be sparking not arcing, arcing is when it jumps an air gap, sparking is when the voltage is to high for whatever the contact patch is (dragging live connectors over each other can result in a tiny contact patch that overheats and melts, a bit like how a fuse melts/blows when to much current is passed through it only on a microscopic level).
 
^JP^ said:
Even though it is 12v DC with ~ 50 amps at 600 watts?

How else could the plastic get hot enough to melt without some kind of spark?
Click to expand...

As builzoid said, you don't need fire to melt plastic - even just blowing a heatgun with hot air at plastic will melt it or cause the plastic particles to start breaking up
 
Grim5 said:
He does raise a good question - if the solder points are the problem like Igor says they are and they are causing wires to break off then 1) why are connectors melting at the end of the connector and not at the solder point and 2) why have several YouTubers now tested cutting off the wires on the side to force 600w through half as many wires and yet still couldn't not get the connector to meltn
Click to expand...

They are too scientific with their approach. Yes each individual wire is more than capable of handling more than twice the load but you do not always get perfect binary breaks and situations in the real world.

I would say the problem comes when there is a poor contact and not a total break. If there is a poor contact and you get 100w+ flowing through a very small contact area then there is greater resistance. This is exactly how the filament in a traditional light bulb works, force the same amount of current through a smaller cross sectional area leads to higher resistance and heat is generated.
 
^JP^ said:
Definitely going to be keeping an eye on mine then, even with the Corsair cable it's still the same connector on the gpu
Click to expand...
corsair's 600W 12VHPWR adaptor is different. that cable uses only 2 8pin and has direct cable to ping connection and most likely a crimped cable to pin connection which wont give you the issue or loose connection and increased resistivity.
 
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