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Do you want an RTX 40 and do not know if your source is suitable? NVIDIA responds

Of course we cannot say that there has not been a stir with everything that has been assembled in relation to the consumption, connector and splitter of the RTX 40. We have already denied the problems with the adapters, we have already commented on the requirements that are needed according to the ATX 3.0 standard and the new 12VHPWR connector, but now NVIDIA has officially wanted to put an end to all the doubts and some rumors. So there goes the round of questions and answers about the RTX 40 and power supplies.

It has been NVIDIA itself that has wanted to end once and for all with rumours, speculations and various questions about its RTX 40, power consumption and of course, all the controversy of the 12VHPWR connector as well as its adapters. In the company’s forum, the stuff has launched the typical Q/R with everything you need to know and know to remain calm, and although we have already broken down almost everything, some details are good to know.

NVIDIA RTX 40, power supply, consumption and adapter


The first thing that NVIDIA tells us is precisely what we have already discussed: many questions about this whole topic. For this reason, it directly launches the statement that the RTX 40 does not need a new power supply if it already meets the power recommendations they request. All graphics cards will arrive with a connector/adapter (whatever you prefer to call it) to ensure compatibility with existing fonts.

They add that each adapter has been rigorously tested with a wide range of conditions, after which, they start with the round of questions and answers about the power and PSU recommendations for each card, the number of reconnections that we already clarified and much more, no has waste.

Do I need to upgrade my power supply for the RTX 40 series?

The RTX 40 series does not require a new PSU if our PSU already meets the card’s wattage recommendations. The RTX 4090 have a TGP of 450W and the minimum recommended power supply is 850W. The RTX4080 of 16 GB have a TGP of 320W with a minimum recommended power supply of 750W and the minimum recommended power supply for the RTX4080 of 12GB It is 700W.

How do the power requirements of the GeForce RTX 4090 and 4080 compare to the last generation?

Power requirements have remained the same or have been reduced, while offering substantially higher performance. The RTX 4090 draws the same power as the RTX 3090 Ti, the RTX 4080 16GB draws 30W less than the RTX 3080 Ti, and the RTX 4080 12GB draws 65W less than the RTX 3080 12GB.

Do RTX 40 series cards require a new type of power connector or a new power cable?

No. RTX 40 series cards come with power adapters that allow you to use existing power supplies with 8-pin PCIe connectors, still standard today. RTX 40 series cards can also use the PCIe Gen5 power connector which allows you to power the graphics card with a single cable.

If RTX 40-series cards can use existing connectors and power supplies, why switch to a new connector standard?

The PCIe Gen5 power connector is the new standard for PCIe add-in card power. The standard allows you to power the graphics card with a single cable, which simplifies cable routing and improves airflow within the chassis, among other benefits.

PCI-SIG warned of the potential risk of over current/over power with 12 VHPWR connectors using Gen 5 adapter plugs and non-ATX 3.0 PSUs. Why did PCI-SIG issue the warning and how does this affect new NVIDIA products?

It does not affect newer NVIDIA products. During initial development and testing we identified a potential problem with a prototype connector manufactured by a single vendor. As a member of PCI-SIG, we reported the vendor, asked them to fix it (which they did), and shared our findings to help vendors implementing the new standard. PCI-SIG was passing those learnings on to other vendors.

Why does the adapter only have a 30 cycle life on these new PCIe Gen 5 connectors?

The 30-cycle specification is the same as it has been for the last 20 years on existing 8-pin PCIe/ATX connectors, and hasn’t changed with PCIe Gen5 connectors or power adapters.

Are the RTX 40 series adapters “smart” enough to interface with an ATX 2.0 power supply and properly regulate GPU power?

Yes. The adapter has active circuitry inside that translates the state of the 8-pin plug to the correct sideband signals in accordance with the PCIe Gen 5 (ATX 3.0) specification.

What is a ‘smart’ power adapter?

The adapter has active circuitry that detects and reports power capacity to the graphics card based on the number of 8-pin connectors connected. This allows the RTX 4090 to increase the power headroom for overclocking when using 4 x 8-pin connectors instead of 3 x 8-pin connectors.

If I fold the RTX 40 series adapter, will it cause problems with the connection between my power supply and the GPU?

The adapter has been shown to work in a wide variety of conditions. Follow our compatibility chart – plan for a minimum clearance of 1.4” or 36mm above the top of the graphics card for cable bending and clearance for airflow.

Should I be concerned if my PSU only has 1 available power rail to connect my graphics card (ie only 1 available power connection)?

Connect the original power supply output connectors and cables directly to the included power adapter. Power supplies typically only supply up to 2 x 8-pin PCIe connectors per output cable. RTX 4090 and RTX 4080 16GB require at least 3 x 8-pin PCIe connectors or a connector 450W PCIe Gen 5 or more.

Diagrams provided by NVIDIA for the RTX 4090 and RTX 4080 16 GB

Although only these two graphics cards are discussed, we understand that it is exactly the same for the 12 GB version of the smaller one, except with one less connector. They don’t add anything new, they simply try to graphically show many of the things discussed here so that the most novice user understands the differences between connectors and how to plug them into the adapter if you have a source with ATX 2.X certification (almost 100% of the market now same) or if you decide to buy an ATX 3.0 source with the 12VHPWR cable.

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