RTX 4090 Undervolt Cuts DLSS 5 Power Spike by 47W

NVIDIA GeForce RTX 4090 owners face a significant power management challenge when playing games with DLSS 5 Neural Rendering enabled. The flagship GPU can spike to over 420 watts, creating thermal risks for power connectors. Adjusting the voltage curve offers a practical solution to lower energy consumption without sacrificing performance.

Undervolting to 925 mV reduces power draw without affecting frame rates

A user identified as u/om_the_best on Reddit shared test results demonstrating that undervolting the card to 925 mV resolves these power issues. This specific voltage setting remains stable for the GPU while significantly reducing the electrical load during intensive gaming sessions.

• Tested GPU: GeForce RTX 4090
• Tested Software: DLSS 5 Neural Rendering
• Tested Games: Hogwarts Legacy, Cyberpunk 2077
• Undervolt Setting: 925 mV
• Power Reduction (DLSS 5 On): 47 W

The technical data shows a clear reduction in power draw across two demanding titles. In Hogwarts Legacy, the RTX 4090 dropped from 426 watts to 387 watts. Cyberpunk 2077 saw a similar decrease, falling from 420 watts to 386 watts. The total power savings reached 47 watts in these scenarios.

Despite the lower power consumption, frame rates remained identical to the stock configuration. The user maintained 355-360 FPS in Hogwarts Legacy and consistent performance in Cyberpunk 2077. This confirms that the undervolt does not degrade the visual experience or gaming speed.

This adjustment is particularly useful for users concerned about the thermal stability of their power connections. High-draw GPUs like the RTX 4090 can stress standard power cables, and reducing the load mitigates this risk. We've been tracking GeForce RTX 4090 closely — see our earlier coverage on NVIDIA Locks DLSS 5 to RTX.

Undervolting to 925 mV provides a verified method to manage the high power demands of DLSS 5. The technique cuts power spikes while preserving the full performance benefits of the rendering technology.