Users report melting 16-pin RTX 4090 power adapters, again

[RaXelliX]

AMD will be forced to use 12VHPWR on Radeon 8000 series. They should have done it on 7000 series as well IMO. Instead they made it an actual selling point, which is laughable really - because the new solution is better and can replace 3-4 x 8 pin. Many 7900XTX use 3 x 8pin.

Why?

7000 series design was finished long time ago. Changing the power connector is not something one does weeks before launch. Besides they dont need it. So what's wrong with 8pin? Servers use 8pin EPS. Even Nvidia themselves uses 8pin EPS connector on their server cards instead of this flimsy new one.

Here's an idea - instead of pushing wattage ever higher - why not focus on power efficiency and make do with dual 8pin.

 

[takaozo]

Why everybody suddenly forget about the max number of mating cycle for 12HPWR. When it was introduced the reviewers were worried about the max 30 cycles for this connector.
I know Molex had the same mating cycle but that connector has 300% more contact area.

 

[godrilla]

Those figures are normal. What you want to look for is the voltage consistently dropping below 12 volts. If the sensor is constantly reporting, say, 11.8 volts at full load, then there's something amiss.

Update after afew hours of gameplay I went to check gpuz and I see a range going from 11.9 to 12.3 volts is this normal? The bottom range? Physically touching the connector feels cool as the ambient temperature at the connection site.

 

[neeyik]

Update after afew hours of gameplay I went to check gpuz and I see a range going from 11.9 to 12.3 volts is this normal? The bottom range? Physically touching the connector feels cool as the ambient temperature at the connection site.

It somewhat depends on how frequently the voltage is dropping below 12 volts and what the power consumption is at that time, but I personally wouldn't be too worried about 11.9 volts -- I'd give the connector a thorough check, just to make sure that all the surfaces are completely flush with each other.

 

[takaozo]

Update after afew hours of gameplay I went to check gpuz and I see a range going from 11.9 to 12.3 volts is this normal? The bottom range? Physically touching the connector feels cool as the ambient temperature at the connection site.

What power supply you got there? Looks like a 4% deviation on 12V line. I got the same deviation on a Corsair PSU from 2016. Today PSU's have 2% or less for for 12V.
Check table on page 10 Corsair RM850e ATX 3.0

 

[godrilla]

What power supply you got there? Looks like a 4% deviation on 12V line. I got the same deviation on a Corsair PSU from 2016. Today PSU's have 2% or less for for 12V.
Check table on page 10 Corsair RM850e ATX 3.0

This one https://www.corsair.com/us/en/p/psu...tified-high-performance-sfx-psu-cp-9020186-na

is this deviation of 4% bad?
They have a certification on Cybernetics website tested 11/25/2018 with the same A- rating.

 

[takaozo]

This one https://www.corsair.com/us/en/p/psu...tified-high-performance-sfx-psu-cp-9020186-na

is this deviation of 4% bad?
They have a certification on Cybernetics website tested 11/25/2018 with the same A- rating.

In the TPU review corsair-sf750 I see Aris measured a lower deviation.

"The following charts show the voltage values of the main rails, recorded over a range from 60 W to the maximum specified load, and the deviation (in percent) for the same load range. Tight load regulation is an important characteristic for power supplies since it allows for constant voltage levels despite changes in load."

Best if you check (reseat) connectors and maybe measure with a Voltmeter instead of the Motherboard sensors. That PSU has very god 12V rail regulation and the deviation is very low = 0.12%. Check the values in table "Load Regulation & Efficiency Testing Data - Corsair SF750 Platinum". I guess you use a adapter for 12VHPWR Pin since that PSU dont came with this cable.

 

[takaozo]

" Those who can't avoid using the adapters can check the status of their 16-pin connection with a new feature in GPU-Z."
What would be considered abnormal or prerequisite behavior or markers?
I set my parameters to highest 16 pin power and highest 16 pin voltage. After Firing up Vermitide 2 power peaked at 405 watts and voltage at 12.3 volts. Are these normal?
I have a similar setup since launch 10/22 4090 Suprim liquid at stock ( quiet bios ) set power to 95% seen in latest Precision X1 by default. PSU I am using is the 750 watt sfx platinum by Corsair. While not relevant I was using the 9900ks all core oc 5.1 ghz and upgraded to the 7700x at launch with all core oc to 5.65 ghz. I also have only 3 of the 4 the 8 pins cables connected to the PSU side and use an open H210 itx case to minimize cable angle strain. I am using the factory 16 pin adapter.
If anything happens I will definitely post it here.

Here is one issue:

I also have only 3 of the 4 the 8 pins cables connected to the PSU side

Also 7700x+OCK+MB+RAM+Storage+fans ~= 200w
RTX4090 >450W
Total 650W from 750W, not so much headroom there. I would consider getting a bigger PSU and connecting all 4 adapter to separate 16 AWG cables. Or use native PSu cables.

 

[godrilla]

Here is one issue:

Also 7700x+OCK+MB+RAM+Storage+fans ~= 200w
RTX4090 >450W
Total 650W from 750W, not so much headroom there. I would consider getting a bigger PSU and connecting all 4 adapter to separate 16 AWG cables. Or use native PSu cables.

Hey, seem that the new thermal grizzly 16 pin connector shows 11.9 volts in Jay2cents video.

@ 9:49

 

[takaozo]

Hey, seem that the new thermal grizzly 16 pin connector shows 11.9 volts in Jay2cents video.

@ 9:49

Intel ATX standard mention a +5% / -7% deviation as accepted but hardware reviewers prefer it lower. The dotted lines represent Intel standard and red line the measured values at different loads.

Here is a link to Intel specs: ATX 12v DC regulation
So yes 11.9v it's well into specs, but a good PSU with 12v line with deviation lower than 1% and 16 AWG wires it's preferred.
Sometimes the voltage drop represents a sign of a bigger resistance or contact issues.
If you are really worried about this get a thermometer with a small probe (small enough to fit inside connector, and keep an eye on temps.

 

[godrilla]

Intel ATX standard mention a +5% / -7% deviation as accepted but hardware reviewers prefer it lower. The dotted lines represent Intel standard and red line the measured values at different loads.

Here is a link to Intel specs: ATX 12v DC regulation
So yes 11.9v it's well into specs, but a good PSU with 12v line with deviation lower than 1% and 16 AWG wires it's preferred.
Sometimes the voltage drop represents a sign of a bigger resistance or contact issues.
If you are really worried about this get a thermometer with a small probe (small enough to fit inside connector, and keep an eye on temps.

Thank you.

Also do PSU's have variations between the same model? Not everything is manufactured 100% the same as it should. Do do know of any commercial thermometer probe that would fit?

 

[takaozo]

Thank you.

Also do PSU's have variations between the same model? Not everything is manufactured 100% the same as it should. Do do know of any commercial thermometer probe that would fit?

Any thermometer that can work with this type of probe

You can use a scissor to slim it down even more. From what I seen until now most the positive pins are prone to failure.

Edit.Not sure about positive or negative.

 

[Bamda]

That is a 4090 problem, not mine since I didn't buy one. Ownership has its Privileges. LOL

 

[godrilla]

User reporting burning from psu side. Also 20 cablemods 16 pin burned as well.

https://www.tomshardware.com/news/12vhpwr-connector-melting-psu-side