• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.
  • The forums have been upgraded with support for dark mode. By default it will follow the setting on your system/browser. You may override it by scrolling to the end of the page and clicking the gears icon.

Any way in software to verify 12VHPWR cable power limit?

Joined
Dec 16, 2010
Messages
1,684 (0.32/day)
Location
State College, PA, US
System Name My Surround PC
Processor AMD Ryzen 9 7950X3D
Motherboard ASUS STRIX X670E-F
Cooling Swiftech MCP35X / EK Quantum CPU / Alphacool GPU / XSPC 480mm w/ Corsair Fans
Memory 96GB (2 x 48 GB) G.Skill DDR5-6000 CL30
Video Card(s) MSI NVIDIA GeForce RTX 4090 Suprim X 24GB
Storage WD SN850 2TB, Samsung PM981a 1TB, 4 x 4TB + 1 x 10TB HGST NAS HDD for Windows Storage Spaces
Display(s) 2 x Viotek GFI27QXA 27" 4K 120Hz + LG UH850 4K 60Hz + HMD
Case NZXT Source 530
Audio Device(s) Sony MDR-7506 / Logitech Z-5500 5.1
Power Supply Corsair RM1000x 1 kW
Mouse Patriot Viper V560
Keyboard Corsair K100
VR HMD HP Reverb G2
Software Windows 11 Pro x64
Benchmark Scores Mellanox ConnectX-3 10 Gb/s Fiber Network Card
I'm having trouble with my RTX 4090's power limit. GPU-Z reports a "PWR" limiter whenever the GPU gets to 450W power draw. The card I have should have a 480W power limit by default, and when I set the power limit to 110%, that should raise it to 530W.

I suspect that the 12VHPWR cable connecting my PSU to my GPU is the culprit because it's seems too coincidental that the power limit is exactly 450W, which would be the cable limit if one of the sense pins was not properly connected. However, I have checked the plug with a multimeter and both sense pins are connected to neutral since there is continuity when touching a sense pin and any other black wire coming from my PSU.

Before I go further with the hardware investigation, is there a way in software to confirm that the cable (and not software) is limiting the card to 450W? I could not find anything in NVIDIA's control panel, in GPU-z, or through an internet search that will report the power limit of the cable.
 
Those are sense pins. You need all 4 for 600. Lots of content on this. Maybe if you jump the pins you can bypass this. I wouldn't suggest it though
 
Maybe a damaged cable have you tried the supplied octopus adapter cable?

Is the nvidia supplied cable the one you are already using?

I have a cablemod cable that is 4x8 to 16 pin and has no issues doing 600w.
 
Igor wrote an excellent article that should clarify how does the 12VHPWR/2x6 system works


That doesn't jive with my research. Look at images of manufacturer-supplied 600W 12VHPWR cables. They all have only two sense pins. Examples below:


I believe your question should also be answered by Igor's article as well. Hint: sense pins 3 and 4 don't really do much.
 
Back
Top