PCIe Gen5 “12VHPWR” power connector for 150W, 300W, 450W and 600W settings

Intel ATX 3.0 Specification for PCIe Gen5 Power Cable

It looks like the official PCI-Express 5.0 power cable specifications for next-gen graphics cards have been leaked.

The official name of “12VHPWR” is the upcoming standard for PCIe Gen5 graphics cards. Data provided by Intel, who are responsible for defining the ATX specifications, seems to suggest that the cable will support up to four power settings.

Types of PCIe Gen5 power cables, source: @momomo_us/Intel

According to the slides posted by leaker @momom_us, the cable will support up to 600W of power in its full configuration. Additionally, 450W, 300W and 150W modes will be supported.

The documents define the bit pattern of the Sense0 and Sense1 sideband signals. With both signals grounded, the GPU will power up with 375W of power and a maximum sustained power of 600W. If these signals are open, the GPU will receive 100W initially, with a maximum of 150W while charging .

PCIe Gen5 power specs, Source: @momomo_us/Intel

ATX 3.0 design confirms that this power connector will not be compatible with existing 6-pin and 8-pin connectors due to different contact spacing and larger pitch.

The 12VHPWR auxiliary power connector is designed to supply up to 600 watts directly to a PCIe* expansion card. This power connector is not compatible with existing 2×3 or 2×4 auxiliary power connectors. The power pins in the 12VHPWR connector have a 3.0mm spacing while the contacts in a 2×3 and 2×1 connector are on a larger 4.2mm pitch. The 12VHPWR auxiliary power connector has twelve large contacts to carry power and four smaller contacts below to carry sideband signals.

The connector performance requirements are as follows:

  • Power pin current rating: (excluding sideband contacts) 9.2 A per pin/position with 30°C T-Rise limit above ambient temperature conditions at = 12 VDC with all twelve contacts energized. The connector body shall display an embossed H+ character or label to indicate support for 9.2 A/pin or greater. Refer to the approximate placement of the marker on the right angle (R/A) 12VHPWR PCB header.

But that of course doesn’t mean that graphics cards with a 12+4 pin power connector won’t work with adapters.

PCIe Gen5 power specs, Source: @momomo_us/Intel

Several power supply manufacturers have already confirmed their first products equipped with the new standard. As for graphics cards, NVIDIA’s flagship RTX 3090 Ti Founders Edition was supposed to be the first graphics card to feature this type of connector. However, since its introduction at CES 2022 in early January, NVIDIA has not provided any update on a potential launch date for this model.

It’s also said that next-gen NVIDIA RTX 40 “Ada” graphics cards will all come with this new 12+4-pin power connector, but it’s unclear if that also means NVIDIA’s own reference models. NVIDIA or custom designs.

Source: @momomo_us via WCcftech



Alan A. Seibert