A Reminder, Guys, Undervolt your GPUs Immediately. You will Significantly Decrease Wattage without Hitting Performance.

Reddit r/LocalLLaMA / 4/1/2026

💬 OpinionDeveloper Stack & InfrastructureTools & Practical Usage

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Key Points

The post recommends undervolting GPUs using MSI Afterburner to reduce voltage and significantly lower power draw without sacrificing performance.
It reports measured results from a dual-GPU setup where undervolting reduced an RTX 3090 from ~350–380W to ~290–300W and an RTX 5070 Ti from ~250–300W to ~180–200W under full load.
The author claims GPU temperatures stayed low despite tight card spacing (down to ~60°C for the air-cooled 5070 Ti and ~50°C for the 3090).
It also notes that adjusting fan behavior via FanControl did not harm performance and may have slightly improved FPS on the 5070 Ti.
Overall, the guidance is practical power/thermals optimization for local gaming and local AI-style workloads where GPU efficiency matters.

I am sure many of you already know this, but using MSI Afterburner, you can change the voltage your single or multiple GPUs can draw, which can drastically decrease power consumption, decrease temperature, and may even increase performance.

I have a setup of 2 GPUs: A water cooled RTX 3090 and an RTX 5070ti. The former consumes 350-380W and the latter 250-300W, at stock performance. Undervolting both to 0.900V resulted in decrease in power consumption for the RTX 3090 to 290-300W, and for the RTX 5070ti to 180-200W at full load.

Both cards are tightly sandwiched having a gap as little as 2 mm, yet temperatures never exceed 60C for the air-cooled RTX 5070ti and 50C for the RTX 3090. I also used FanControl to change the behavior of my fans. There was no change in performance, and I even gained a few FPS gaming on the RTX 5070ti.

submitted by /u/Iory1998
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