For those who don’t know, the RTX 5090 Astral has sensors to monitor voltage and current for each pin of the 12vhpwr connection. First and foremost, yea, this shouldn’t even be necessary and/or should probably be standard across all cards using 12vhpwr and no one should have to pay the “ROG Tax” to have it (which I paid specifically to have this). Yes, there are alternatives you can buy to monitor voltage and current, but I’m vain AF :p
Last week my 9800x3D decided to die on my x670e mobo (not even ASRock, yay me), throughout troubleshooting steps and eventually trying a new CPU I had to unplug my 5090’s 12vhpwr cable 3-ish times as I mounted it vertically and it blocks some components from being accessible while installed. This 12vhpwr cable is the same I used on my previous video card since late 2022 and handful of plug/unplug cycles throughout its use. I got my Astral in early March (before the second price increase thank god) and the current + voltage levels were all fine in both idle and heavy load. However, after the plug cycles this week and installing the new CPU, I noticed that the idle ranges on pins 2 and 4 were higher than before, now each idling around 0.7-0.85 while the rest were 0.5-0.6. “Weird” was my initial thought, so I figured I’d run Cyberpunk’s benchmark while leaving GPU Tweak III up on my second monitor to see current + voltage range under load… barely 15 seconds after booting the game, still at the main menu and not the benchmark, pins 2 & 4 spiked over 9.25 and turned red in GPU Tweak (not high enough for the software’s alarm to go off, but high enough for concern). Immediately quit the game, shut down my computer, and install a fresh 12vhpwr cable that I ordered when I got my Astral as a “just in case”, all voltages and current are now even and in safe levels. And yes, the prior cable was fully plugged in, not bent, not “wiggled” - I always quadruple-check it when plugging it in.
Moral of the story? Two things: 1.) F this stupid design and its lack of common-sense safety features. 2.) if you’ve had 8-10+ total plug/unplug cycles on your 12vhpwr cable, consider just buying + installing a fresh one instead.
BTW, this post was immediately removed on nvidia’s subreddit by mods because I guess they don’t want people using fresh cables to avoid dead cards + damaged PSUs…? *shrug <- EDIT + UPDATE: it was an auto-mod bug, a mod messaged me and put my post back up. Safety PSAs for all!