Tuf 3090 Ti power requirements

[Hopper64]

This 3090 Ti Tuf GPU ships with a 3x 8 pin converter for power connecting 3 8-pin connectors to supply sufficient power to the 12 pin connection. As here:

*https://www.guru3d.com/articles-pages/asus-geforce-rtx-3090-ti-tuf-gaming-review,3.html

You can see towards the bottom of that page the converter cable. But Corsair makes the following for any type 4 compatible PSU:


*https://www.corsair.com/us/en/Categories/Products/Accessories-%7C-Parts/PC-Components/Power-Supplies...

This is compatible with my Corsair 1600i PSU, but I don’t think it will supply sufficient power since there are only 2 8-pin connections with this cable. This connects directly to the PSU, but with 400+ watts consumed, I don’t think it will be capable of suppling the necessary juice. I am thinking 150W per 8-pin connector, there’s no way to get to >400W even with the 75W on the PCIe slot.

Any experience with this? Are my calculations correct for power requirements here? Thanks.*

[Murph_9000]

I think you're correct. CableMod, who I trust to get that sort of thing right, list 2 different 12 pin options in their configurator for the Corsair AX1600i. One is 3x8 to 12 for the 3090 Ti, and the other is 2x8 to 12 for "NOT 3090 Ti". Corsair probably released that 2x8 cable before the 3090 Ti was released, and have not yet thought to update the page (not good, since it's essentially a safety issue).

If I was building a 3090 Ti system, I wouldn't cut corners on power delivery.

[Hopper64]

Murph_9000 wrote:
I think you're correct. CableMod, who I trust to get that sort of thing right, list 2 different 12 pin options in their configurator for the Corsair AX1600i. One is 3x8 to 12 for the 3090 Ti, and the other is 2x8 to 12 for "NOT 3090 Ti". Corsair probably released that 2x8 cable before the 3090 Ti was released, and have not yet thought to update the page (not good, since it's essentially a safety issue).

If I was building a 3090 Ti system, I wouldn't cut corners on power delivery.

Murph-Do you have a link to the 3x8 to 12 cable? Thanks. Â*

[Hopper64]

Thanks. It was just a gut instinct that the cable listed wouldn’t deliver enough power to the card. I’ll check out cable mod for a solution. Appreciate your help.

[xeromist]

Whether it's actually an issue is going to depend on the gauge and length of the wires. Cablemod allows you to customize a much longer version so it's not surprising they would want to err on the side of caution. Still, it would be nice if Corsair updated the product listing to include a list of supported card classes just to make things clear.

[Hopper64]

Never mind Murph. I believe I found it. Does cable mod have a good reputation? How long does it take them to ship? Thanks.

[Murph_9000]

Hopper64 wrote:
Never mind Murph. I believe I found it. Does cable mod have a good reputation? How long does it take them to ship? Thanks.

The thing I was looking at was their custom PSU cables, in their configurator, where they have options for the 3000 series 12 pin. I don't think they do off the shelf / pre-made cables for that connector.

Yes, their reputation seems to be excellent. ASUS promote them with a voucher and CableMod cable combs included with the ROG PSUs. Various YouTube builders speak positively about them. I think it's typically a couple of weeks for custom cables from them, but depends on how many orders are in their queue.

[Hopper64]

Thanks. I will probably look into ordering from them sometime today.*

[Nate152]

The ASUS RTX 3090 Ti Tuf Gaming has a 16-pin power connector, it comes with a 3x8-pin to 16-pin power adapter cable.

The 2x8-pin to 12-pin is for the RTX 3080/3090.

If this is the new trend, we should see future psu's supporting this type of connector.

[Murph_9000]

Nate152 wrote:
The ASUS RTX 3090 Ti Tuf Gaming has a 16-pin power connector, it comes with a 3x8-pin to16-pin power adapter cable.

The 2x8-pin to 12-pin is for the RTX 3080/3090.

If this is the new trend, we should see future psu's supporting this type of connector.

As I understand it (and it's very new, so I may be wrong), the 16 pin and the 12 pin are functionally equivalent and physically compatible if you don't have a smart power supply with 16 pin PCIe power. The extra 4 pins are data pins to allow the PSU and card to negotiate the power delivery. If there's no signal on those data pins, such as when plugged into an old PSU, it's supposed to default to whatever the basic / standard power limit is for that connector. If the data is connected, it enables a negotiated higher power level for nVidia's latest/future thermal generators.

I could easily be wrong, that's just my quick understanding of a very new development in that area of tech.