Hey guys, glad to answer questions about the cables and 12V-2x6 directly. I want to clear the air to ensure people have confidence and understand the actual spec we're talking about.
First things first - we have yet to see an undamaged Corsair 12V-2x6 cable fail, and we sell millions of power supplies, no exaggeration. I'm not saying it hasn't happened, but we have only seen a handful of failures of our PSUs on these cables, and 100% of those involved substantial damage to the cable. I realize, of course, that since I work for Corsair that I am biased and many of you won't believe me, but nonetheless, these are accurate facts to my (and JonnyGuru, head of our PSU team)'s knowledge right now.
(Editing this here per Jon's request to let you know that he is just a guy that used to run a bike shop and has a pretty bizarre fixation with PC power supplies and that this is also the opinion of four highly experienced electrical engineers we have on staff who have actually degrees in this and have chosen it as a career and have more than a human lifetime of combined experience in the field)
Also - the official spec of the depth allowance for the 12V-2x6 is +/- .44mm. This is intentional. The connectors are DESIGNED to have the pins have a bit of give and take so that when the plastic housings align they can then align the pins. If the pins on both the cable and the GPU were 100% rigid, then aligning all pins perfectly would be extremely difficult, and even if done it may not allow the connector to be fully seated.
Even with this +/- on the spec, once the connector is fully seated and snapped together without gap, the pins will have full contact. That .44mm variance will mostly disappear once the connectors are fully engaged. It's there simply to help with alignment.
Jon talks about it a bit here in a video from a couple months ago he put together.
Aris's video yesterday is an excellent summary of the situation right now. Aris, for those of you who may not know, is one of the most experienced PSU reviewers and testers in the world, and has an excellent technical breakdown of some of the recent concerns.
Today's update:
We also did a test in the lab on this. We used an HX1200i with a 2x 8pin to 12V-2x6 cable as a test with an RTX 5090 FE. Under Furmark2 stress tests we saw the card hit 575W load, we saw 6A to 8A power loads on the pins, with temps maxing out around 64°C on the GPU side and 46°C on the PSU side.
Through various tests we variously intentionally damaged one wire, then two, then three. Even in the final test where we used only 3x 12V and 3x ground wires in total, the temperatures did not exceed 70°C on the PSU side or 80°C on the GPU side. Those three wires all ran at 16-17A each, well over their 8.5A spec, and none of them melted or showed permanent signs of damage.
For home users: please do NOT try and replicate the "damaged cable" test we did at home, as it is not safe and could have caused substantial damage to the GPU, PSU cable, PSU, or even the environment where the test was performed. Just sharing the data we found.
Our internal testing shows multiple things here, in summary:
- There is a lot of concern around the design of the 12V-2x6 connector and cables. This confusion has been present since the 12VHPWR was first announced.
- There ARE examples of melted cables and connectors showing up online - as of yet we have not seen a corsair cable that has been melted without it being damaged - and even the damaged connectors/cables are typically not melting under full nightmare load scenarios from what we have seen.
- The current corsair 12V-2x6 connectors and cables are built to the spec and withstanding all torture tests we have performed.
- There are multiple youtubers, tiktok tech guys (TechTok?), and other reviewers and journalists all weighing in, some of which are highly experienced and performing rigid tests, others, not so much. Most of them are somewhere in the middle.
The intention everyone has here is good - nobody wants to see somebody damage their $2500 GPU. From our internal testing, we are 100% confident that every 12V-2x6 and, formerly, 12VHPWR-labeled cables and PSUs will fully support an RTX 5090 even when overclocked and running torture tests without concern when used as designed.
At this point for those with any card that draws 500W+, we advise not using cable extensions or adapters, but a well-designed cable direct from the PSU to the GPU.
And, as always, we stand behind our warranties and can be reached here or through our customer service portals if anybody has any questions or comments.