It's happening again, melting 12v high pwr connectors

[taka]

Or be a man and tear down your PSU and GPU, remove the connectors with a heat gun and a 100W solder iron. Put some 16AWG-LSZH cables instead. For safety you can add 10Ah fuses for each wire.
Problem solved and warranty terminated, but no worries.

 

[Vayra86]

I'm glad we're at page 25 and we can still just quite simply conclude the cable is underspecced for its job and far too prone to manufacturer variance. Something, again... a child could tell you given the size of the older cable and its rated wattage. Simple game of spot the 10 differences.

Let's go guys, page 50 you can do it. Don't forget to keep buying in the meantime.

 

[Dredi]

far too prone to manufacturer variance.

Or to unbalanced current distribution.

The connector is rated to 10mOhm max. resistance for the connection. Min. is likely super close to 0 Ohm. So assume 0-10mOhm resistance in the connection for a connector that is _within spec_.

The cable has a resistance of 13Ohm per kilometer, so for a 50cm psu cable the resistance is 7.5mOhm.

A total system of two connectors (within spec) and a 50cm cable in between has a resistance ranging from 0-10 + 7.5 + 0-10 Ohm, so 7.5 to 27.5 Ohm.

Now, lets calculate the worst case current distribution for a six lead cable, that is within spec, using https://www.digikey.fi/en/resources...conversion-calculator-circuit-current-divider
So lead 1 with resistance of 7.5 Ohm and the rest at 27.5 Ohm. Total current at 50 A, the max. spec for the cable.

What we get is 21.1 A for lead 1 and 5.8 A for the rest.

FOR A CABLE THAT IS WITHIN SPEC, AND CONNECTED AT EACH END WITH RESISTANCES WHICH ARE ALSO WITHIN SPEC.

The max. current for the individual pins in the amphenol spec is 12 A. It is impossible to guarantee that number without any load balancing, even for cables that are perfectly within spec.

 

[R0H1T]

Or be a man and tear down your PSU and GPU, remove the connectors with a heat gun and a 100W solder iron.

Real men don't need cable

Spoiler

 

[chrcoluk]

Corsair officially reacted to the JayzTwoCents Video on Reddit:
https://www.reddit.com/r/Corsair/comments/1iovz6i/_/mcnjpig

To me that doesnt give confidence.

Someone should have took responsibility on the inconsistent pin height issue on those cables, we know there is issues with pin contact and such and they supplying cables to customers with issues that are visible to the naked eye.

Molex style cables have always had this type of vulnerability, where you need a lot of pressure to connect the cable, and it basically is prone to structural issues.

The proper solution is to ditch these new connectors and stop making 600W gpu's but we know that wont happen, so another option would be to use externally connected power, from back of PSU to back of GPU, or even direct from socket to GPU, main issue being though it has to fit within a gap of a pcie slot bracket.

 

[Bomby569]

In relation to both JohnnyGuru and Aris coming out saying you can't pass 20A though a single wire of a 12VHPWR / 12V2X6 cable, it looks like Aris has changed his stance to you can after Derbauer's latest video:

What I don't get is, why didn't they at least test this before making statements. People were lead to doubt Derbauer and understandably after two experts came out saying 20A+ isn't possible on a single cable.

Now that we know that Derbauer's results are valid, we need someone else to confirm them. I'd also like to see testing done for other modes of failure.

speak first check later, that's why we are in this mess. Shitty experts

 

[R0H1T]

To me that doesnt give confidence.

There's a reason for that, no one wants to touch this radioactive Chernobyl sh!t

Goes without saying that none will take responsibility & thus liability with that.

 

[Degreco]

So here we are - 25 pages later and not any wiser. A week full of uncertainty. YouTubers are now engaged in pathetic wars, fighting over vanity, while their fans wage their wars on the forums.

Can you or can’t you pull 20+ amps with a AWG16 cable? Will it melt instantly, or will it take a couple of minutes?

This is the academic level of discussion we’ve reached.

And while everyone including GN (who apparently need more time), Jay, Roman, Aris and everybody else can’t definitively say whether this is a real issue or not, the forums are full of opinions.

Meanwhile, Nvidia stays silent. Practically ghosting their community. They’re worth trillions of dollars, yet can’t assign a small task force or even issue a brief statement to keep the public from going nuts.

Not that it matters, you can't buy the cards now. But still:
What a very badly managed situation.

 

[R0H1T]

Can you or can’t you pull 20+ amps with a AWG16 cable?

You can probably do a 1000A as well, if it's super cooled. This point of contention is beyond stupid, it's unsafe that's the bottom-line!

 

[Degreco]

You can probably do a 1000A as well, if it's super cooled. This point of contention is beyond stupid, it's unsafe that's the bottom-line!

Yeah i know. I tried to keep this YT nonsense short. They fight for their 'expert' reputation. A vain parade. There is no value in this.

For me, there is only one question: Is the 12VHPWR standard safe or not safe at give or take 600w for the DIY market?

 

[R0H1T]

I keep coming back to this marketing blitzkrieg by JHH & the whole media ecosystem, starting with ~

When your whole life flashes before your eyes, how much of it do you want to not have ray tracing?

Just Buy It: Why Nvidia RTX GPUs Are Worth the Money

Some enthusiasts are upset about the price of the Nvidia RTX 2080 / 2070, but the opportunity cost of sticking with old technology is higher.

www.tomshardware.com

And yet they still keep feeding it

 

[Vayra86]

Or to unbalanced current distribution.

The connector is rated to 10mOhm max. resistance for the connection. Min. is likely super close to 0 Ohm. So assume 0-10mOhm resistance in the connection for a connector that is _within spec_.

The cable has a resistance of 13Ohm per kilometer, so for a 50cm psu cable the resistance is 7.5mOhm.

A total system of two connectors (within spec) and a 50cm cable in between has a resistance ranging from 0-10 + 7.5 + 0-10 Ohm, so 7.5 to 27.5 Ohm.

Now, lets calculate the worst case current distribution for a six lead cable, that is within spec, using https://www.digikey.fi/en/resources...conversion-calculator-circuit-current-divider
So lead 1 with resistance of 7.5 Ohm and the rest at 27.5 Ohm. Total current at 50 A, the max. spec for the cable.

What we get is 21.1 A for lead 1 and 5.8 A for the rest.

FOR A CABLE THAT IS WITHIN SPEC, AND CONNECTED AT EACH END WITH RESISTANCES WHICH ARE ALSO WITHIN SPEC.

The max. current for the individual pins in the amphenol spec is 12 A. It is impossible to guarantee that number without any load balancing, even for cables that are perfectly within spec.

Aye so connect a few more, not unlike the past.

Yeah i know. I tried to keep this YT nonsense short. They fight for their 'expert' reputation. A vain parade. There is no value in this.

For me, there is only one question: Is the 12VHPWR standard safe or not safe at give or take 600w for the DIY market?

The simple answer is no and all you need is to compare cold hard numbers between this pos and Pcie connectors/cables standards.

Everything else is cognitive dissonance.

 

[Dredi]

Aye so connect a few more, not unlike the past.

For 1200W cards? 1800W?

Why?

With two in spec cables the problem would still persist. Maybe even with three, but that would maybe be pretty close to being ok.

Madness. Just do some load balancing, not unlike the past, and you are golden.

 

[Vayra86]

For 1200W cards? 1800W?

Why?

Its not 1800W you've got. That's the max draw the trio of cables can have. And we've clearly seen they can't have that.

In my view you have 3x375W at that point. That's just over 1K. And since the 5090 can have transient peaks of 900W, I think that seems about right.
Two? You could probably wing it, too.

One? Well, even the 4090 isn't happy with one apparently.