gddr6

Reads GDDR6/GDDR6X VRAM memory temperatures from multiple supported NVIDIA GPUs found in a host Linux system. These findings are based on reverse engineering of the NVIDIA GPU Linux driver.

Experimental: RTX 5090 (GDDR7)

Experimental support for the RTX 5090 (Blackwell / GB202, GDDR7) is included. It reads the per-module DRAM sensors directly and reports the hotspot (hottest module) by default:

sudo gddr6                # VRAM hotspot temperature
sudo gddr6 --per-module   # each of the 8 GDDR7 modules separately

This is reverse-engineered and unofficial (NVIDIA does not expose memory temperature via nvidia-smi/NVML on this card) — treat the readings as approximate.

For a dedicated Blackwell app with a TUI (plus ASCII/JSON output) and a reusable C library, see gpuwatch.

Prerequisites

Kernel boot parameter: iomem=relaxed

This step is optional. In some Linux distributions, the default kernel boot parameters are sufficient to run this program.

sudo vim /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash iomem=relaxed"
sudo update-grub
sudo reboot

Disabling Secure Boot

This can be done in the UEFI/BIOS configuration or using mokutil:

mokutil --disable-validation

Check state with:

$ sudo mokutil --sb
SecureBoot disabled

Dependencies

libpci-dev

sudo apt install libpci-dev -y

Installation (cmake)

git clone https://github.com/olealgoritme/gddr6
cd gddr6
./build_install.sh
sudo gddr6

Supported GPUs

RTX 5090 (GB202) — GDDR7, experimental (see above)
RTX 4090 (AD102)
RTX 4080 Super (AD103)
RTX 4080 (AD103)
RTX 4070 Ti Super (AD103)
RTX 4070 Ti (AD104)
RTX 4070 Super (AD104)
RTX 4070 (AD104)
RTX 4060 Max-Q / Mobile (AD107)
RTX 3090 Ti (GA102)
RTX 3090 (GA102)
RTX 3080 Ti (GA102)
RTX 3080 (GA102)
RTX 3080 LHR (GA102)
RTX 3070 (GA104)
RTX 3070 LHR (GA104)
RTX A2000 (GA106)
RTX A4500 (GA102)
RTX A5000 (GA102)
RTX 6000 Ada Generation (AD102)
L4 (AD104)
L40S (AD102)
A10 (GA102)