A developer who goes by Panchovix has released three tools that let NVIDIA GeForce RTX 50, RTX 40, and RTX 30-series owners run a modified VBIOS without writing anything to the card’s flash chip. The first is a VBIOS editor for Windows and Linux that can change power limits, voltage ceilings, current (OCP) limits, fan channels, and the core and memory offset ranges. Edited images keep NVIDIA’s original signature, which no longer matches, so they can’t be flashed with nvflash. Patched tools did break NVIDIA’s BIOS signature lock for crossflashing back in 2023, but this approach skips flashing altogether. On Windows, the loader stores the edited image in the GPU’s driver registry key, where the driver picks it up as an override every time the device starts, and it only needs a quick GPU restart. The Linux loader instead patches NVIDIA’s open kernel modules so the GSP firmware starts with the custom image, with Fedora 43 being the only distro tested on real hardware so far.
The screenshots show how this works in practice. On what appears to be an RTX 5090 Founders Edition ROM, the board power ceiling went from 600 W to 700 W and the NVVDD and MSVDD voltage ceilings from 1,110 mV to 1,150 mV. An RTX 4090 ROM had its power ceiling raised from 666 W to 750 W and its core offset range doubled to +2,000 MHz, and nvidia-smi later confirmed that card’s power limit going from 550 W to 671 W. Apparently, an RTX 5090 reached 800 W, an RTX 5080 went from 360 W to 500 W, and an RTX 5060 Ti from 185 W to 300 W in the developer’s own testing. Laptop RTX 40 GPUs can’t be edited yet, and memory timings can’t be changed since the card reads them directly from the flash chip.
The Windows loader needs driver 616.56 or newer, which is interesting, as NVIDIA shut down mVolt+’s RTX 50 power limit unlock with a driver update back in August. The loader even writes the same registry values mVolt+ uses for loading a VBIOS, and there’s no word on whether NVIDIA plans to close this route too. Both loaders are open source, though the editor’s GitHub page lists it as closed-source binaries. Raising power and voltage limits also carries real risk, and readers trying this are advised to keep a copy of their original ROM and test on a GPU that isn’t driving the display.
