PCI-SIG worried: possible thermal variance with PCIe 5.0 power cables

PCI-SIG organization is worried about the potential of thermal variance with 12VHPWR (PCIe Gen5) power cable adapters, rightfully so considering.

PCI-SIG worried: possible thermal variance with PCIe 5.0 power cables
Published Sep 11, 2022 11:20 PM CDT
3 minutes & 48 seconds read time

If you don't know already: next-gen power supplies are coming thanks to next-gen PCIe 5.0 graphics cards that will need to chew down more power, much more power.

PCI-SIG worried: possible thermal variance with PCIe 5.0 power cables 05 | TweakTown.com

The new 12VHPWR cable plug connector

The new ATX 3.0 power supplies will include new PCIe Gen5 connector -- the new 12VHPWR power connectors -- and now the PCI-SIG organization is sending out emails to PCI-SIG members that it's concerned over "thermal variance" of using regular 8-pin PCIe power cables into 12VHPWR power adapters.

Why is this an issue? Well, until the last generation we were hitting around 300W maximum power consumption for most mainstream GPUs, while some cards were made to hit 450W like NVIDIA's last flagship GeForce RTX 3090 Ti graphics card. Even then, NVIDIA was using a new PCIe power connector that split from the 12-pin PCIe cable to 3 x 8-pin PCIe power connectors (150W per 8-pin PCIe power connector = 450W total) for its GeForce RTX 3090 Ti.

The PCB and cooling systems were tested by AIB partners, including the MSI GeForce RTX 3090 Ti SUPRIM X and ASUS ROG Strix LC GeForce RTX 3090 Ti OC Edition graphics cards that we reviewed when they were released earlier this year, as NVIDIA was preparing AIB partners for 450W+ designs.

PCI-SIG worried: possible thermal variance with PCIe 5.0 power cables 528 | TweakTown.comPCI-SIG worried: possible thermal variance with PCIe 5.0 power cables 529 | TweakTown.com
PCI-SIG worried: possible thermal variance with PCIe 5.0 power cables 530 | TweakTown.comPCI-SIG worried: possible thermal variance with PCIe 5.0 power cables 531 | TweakTown.com

16-pin power connector to 3 x 8-pin PCIe power connectors (source: TweakTown)

Do you have to worry about it? Not if you buy yourself a new ATX 3.0-compatible power supply when you purchase your new graphics card if it has the 16-pin Gen5 power connector. If the GPU genuinely requires up to 600W of power, then you're going to want to buy a new high-quality ATX 3.0-based PSU.

PCI-SIG is concerned about users that might buy a new GPU that uses the new 12VHPWR power connector, with power adapters from the new power connectors plugged into your old PSU. If the GPU starts having these "power excursions" and driving 600W+ and some... then those adapters might (probably) will run into issues.

PCI-SIG worried: possible thermal variance with PCIe 5.0 power cables 04 | TweakTown.com

ATX 3.0 "12VHPWR" connector specs (source: Wccftech)

How? Well, the power cable adapters you'd need would need to go from the new 12VHPWR and into 3 x 8-pin or 4 x 8-pin PCIe power connectors... the triple 8-pin for 450W graphics cards, and quad 8-pin for 600W graphics cards of the future. There are safety risks with that obviously, but not if you buy an ATX 3.0-compliant PSU which has 600W-ready 12VHPWR power connectors.

PCI-SIG worried: possible thermal variance with PCIe 5.0 power cables 05 | TweakTown.com

The new 12VHPWR cable plug connector

The email that Wccftech saw, explained:

Dear PCI-SIG Member,

Please be advised that PCI-SIG has become aware that some implementations of the 12VHPWR connectors and assemblies have demonstrated thermal variance, which could result in safety issues under certain conditions. Although PCI-SIG specifications provide necessary information for interoperability, they do not attempt to encompass all aspects of proper design, relying on numerous industry best-known methods and standard design practices. As the PCI-SIG workgroups include many knowledgeable experts in the field of connector and system design, they will be looking at the information available about this industry issue and assisting in any resolution to whatever extent is appropriate.

As more details emerge, PCI-SIG may provide further updates. In the meantime, we recommend members work closely with their connector vendors and exercise due diligence in using high-power connections, particularly where safety concerns may exist

Thank You.

Buy at Amazon

ASUS ROG Thor 1000W Platinum II Fully Modular Power Supply

TodayYesterday7 days ago30 days ago
$359.99$359.99-
* Prices last scanned on 9/23/2022 at 11:32 pm CDT - prices may not be accurate, click links above for the latest price. We may earn an affiliate commission.
NEWS SOURCE:wccftech.com

Anthony joined the TweakTown team in 2010 and has since reviewed 100s of graphics cards. Anthony is a long time PC enthusiast with a passion of hate for games built around consoles. FPS gaming since the pre-Quake days, where you were insulted if you used a mouse to aim, he has been addicted to gaming and hardware ever since. Working in IT retail for 10 years gave him great experience with custom-built PCs. His addiction to GPU tech is unwavering.

Newsletter Subscription

    Related Tags

    Newsletter Subscription
    Latest News
    View More News
    Latest Reviews
    View More Reviews
    Latest Articles
    View More Articles
    Partner Content
    Advertise With Us