NVIDIA RTX 50 SERIES - Technical/General Discussion

[Ascendancy]

They need to fix the fact the card is pulling so much more power down just one of the cables instead of evenly distributing the power.
Maybe it can be fixed in a bios update? Unless that power is physically going somewhere it is needed instead of being controlled by programming...

Impossible to fix on the FE using software. The 6 pins are all terminated into 1 when it hits the PCB. The card has no idea what each individual pin is doing on the other side of the connector.

 

[0121danwilliams84]

Impossible to fix on the FE using software. The 6 pins are all terminated into 1 when it hits the PCB. The card has no idea what each individual pin is doing on the other side of the connector.

Is this the same type of design for the other AIBs? I know the Astral has the extra shunts...

 

[0121danwilliams84]

It should do the same thing, but you’re better off using whatever comes with the card to avoid the whole ‘you used a 3rd party cables’ issue, should there be a problem.

If you do use a third party adaptor regardless, it is probably worth going with a H++ (new) version rather than a H+ (old) version… although as discussed above despite some conflicting info, the current consensus is that there is actually no difference between H+ and H++ on the cable side (it’s only the female side of the connector that has changes).

So, I know the bundled x4 8 pin adapters are meant to split the load 150w each. Does a third party x4 (for example the cablemod 600w cable) do the same thing or just do 300w down 2 wires and keep 2 redundant?

 

[jonneymendoza]

Impossible to fix on the FE using software. The 6 pins are all terminated into 1 when it hits the PCB. The card has no idea what each individual pin is doing on the other side of the connector.

So how could they fix it

 

[Peter UK]

Is this the same type of design for the other AIBs? I know the Astral has the extra shunts...

Watch the video that @Glanza linked - while it has more shunts they are still all connected together on the other side. So the Astral can warn you when there's uneven power draw across pins (which is much better than nothing) but can't regulate it. What they could do is stop the card from working when X number of shunts don't have power passing through them or something but whether they actually do that is a different matter.

 

[Ascendancy]

So how could they fix it

 

[jonneymendoza]

So fe users are screwed?

 

[Nitefly]

So, I know the bundled x4 8 pin adapters are meant to split the load 150w each. Does a third party x4 (for example the cablemod 600w cable) do the same thing or just do 300w down 2 wires and keep 2 redundant?

I don’t know, I’m afraid.

 

[Ascendancy]

So fe users are screwed?

Too early to tell.

People on reddit with the FE have tested their cards with thermal imaging using the same setup Debauer had and found completely normal temperatures. Could be anything from defective FE cards, defective PSUs, defective cables.

Needs more investigation.

 

[no_1_dave]

So, I know the bundled x4 8 pin adapters are meant to split the load 150w each. Does a third party x4 (for example the cablemod 600w cable) do the same thing or just do 300w down 2 wires and keep 2 redundant?

Using the bundled adapter the card only draws 600 watts if you use all 4 connectors.
If you use just 3 connectors the card limits the power draw to 450w

It doesn't boot if you only use 2

 

[jonneymendoza]

Using the bundled adapter the card only draws 600 watts if you use all 4 connectors.
If you use just 3 connectors the card limits the power draw to 450w

It doesn't boot if you only use 2

umm interesting.

or you can undervolt it?

 

[Varys]

WTF is a shunt?

 

[no_1_dave]

umm interesting.

or you can undervolt it?

I guess...

Using 3 connectors limits the draw to 450w and you only lose ~5% performance.
Seems pretty worth it tbh

 

[Ascendancy]

WTF is a shunt?

Shunt resistor. Used to measure current.

 

[jonneymendoza]

I guess...

Using 3 connectors limits the draw to 450w and you only lose ~5% performance.
Seems pretty worth it tbh

Right ok i will do that

 

[Peter UK]

Presumably some (if not all) AIBs must be aware of this being a problem - they're all smart companies with a bunch of electrical engineers working on PCB design. One would assume the reason they didn't just fix this on the 4000 series and 5000 series and make a killing on selling the "card with the connector that never melts" is that something about the architecture design itself from nvidia prohibits that from happening. Just speculation on my part though.

 

[Raiden85]

This vid low key makes me wanna cancel my pre-order.

It blows my mind that Nvidia didn't change something between gens or that they thought going to 575w is sensible.

This issue is getting ridiculous. Thankfully I've had no issues with my Zotac 4090 extreme airo that I've had since launch. The card has been powered up 24/7 with a few thousand hours of gaming, connected to an AX1600i PSU using a 3x8 pin to 16 pin cable, using a cablemod extension type adapter cable. Still though, this connector has to go and something far better needs to be put in its place as it's not fit for purpose.

 

[Nitefly]

WTF is a shunt?

It’s one of the four original ‘house robots’, arguably the least memorable with its aesthetics but probably the most impactful overall.

 

[Rawr]

I have a Corsair PSU similar to derbauer with the 2x8pin on the PSU side. :/ Annoyingly I don't think it came with enough cables to run a card with 4x 8pin.

 

[Cosimo]

WTF is a shunt?

A physical experience you have when your 5090 power cable goes woof and melts.