A new open-source tool running from a USB stick on Windows and Linux machines can unlock additional tensor performance on Nvidia GeForce RTX 20, 30 and 40-series desktop and laptop GPUs by bypassing the company's half-speed AI throttle, without requiring a VBIOS flash or a patched driver.
The project, named nv-uefi-unlocker or the “UEFI pre-driver NVIDIA GPU unlocker”, removes Nvidia's tensor limiter using a community-developed V67 payload that tricks Nvidia's signed Booter firmware into opening the write lock on two speed-selector registers, allowing the tensor units to run at full rate.
The tool runs before the Nvidia driver loads at every boot, meaning there is no need to flash the card's VBIOS or modify the driver. However, the unlock does not persist through power loss, so it must be run again on each boot. The system also needs to boot in UEFI mode with Secure Boot either disabled or configured to trust a self-signed EFI file.
The developer reported that their own laptop RTX 4060 achieved a 65% increase in FP16 matrix multiply performance after using the unlocker. Owner-submitted results show gains ranging from 45% on an RTX 4090 (power-limited) to 91% on an RTX 4080 in BF16 calculations. A full table of reported results lists confirmed working cards, including the RTX 2070, RTX 3060 12GB, RTX 3080, RTX 4060 Laptop, and RTX 4090, among others.
Compatibility is listed as “fully compatible” for RTX 30-series cards and for RTX 40-series laptops and desktops, with RTX 20 series listed as “fully compatible; some models have known issues.” The RTX 2080 and RTX 2080 Ti are reported to fail at boot or handoff. GTX 16-series cards are “theoretically compatible” but untested. RTX 50-series Blackwell cards are not supported, with the development team noting they have “a lot more security” than anticipated.
Laptop GPUs are supported, with the requirement that the discrete GPU be powered at boot, meaning dGPU-only or MUX mode is recommended. On Linux, runtime power management can inadvertently erase the unlock.
The release ships only scripts and self-built binaries; one of the scripts downloads and verifies Nvidia's public driver packages before rebuilding the firmware files locally. For a game's anti-cheat that requires Secure Boot, the tool “CANNOT bypass this requirement,” a developer team member relayed on Reddit.
Zagitta, whose earlier gpu-unlock project is credited as the porting source, noted in its FAQ: “I don't run windows and don't plan to maintain it,” warning Windows users to be careful with unofficial installers.
The development team is working on a boot-from-disk toggle to simplify the process further. The RTX 2080 and RTX 2080 Ti are under review, while the team is still trying to crack RTX 50-series cards.
Analysis
Why This Matters
- Opens up significant AI and compute performance on consumer GPUs that Nvidia artificially throttles, benefiting hobbyists, researchers, and small-scale AI developers.
- Simplifies a previously Linux-only, technically demanding unlock to a USB-boot tool accessible to Windows users, widening the potential user base.
- May void warranties or violate Nvidia's terms of service; users assume risk of instability, particularly when combined with power-limit unlocks that can exceed factory limits.
Background
Nvidia has long used firmware-level limits to differentiate its consumer GeForce cards from its professional workstation and data-centre GPUs, restricting tensor core throughput on most models. Community projects such as Zagitta's gpu-unlock have enabled partial removal of these limits on Linux, but Windows support remained experimental. Nv-uefi-unlocker builds on these efforts by running during firmware initialisation before the operating system loads the graphics driver.
Key Perspectives
- Developer team (nv-uefi-unlocker): Reports that the unlock works safely on many cards, with read-back verification to reduce risk, and that a boot-from-disk toggle is in development.
- Zagitta (gpu-unlock creator): Does not maintain the Windows version and advises caution with unofficial Windows installers.
- Owner reporters: Share benchmark results showing substantial performance gains, but results vary by card, power limits, and thermal conditions.
What to Watch
- Nvidia's response: potential driver-level countermeasures or firmware updates that block the unlock.
- Extension to RTX 50-series: the team's progress on cracking the increased security on Blackwell cards.
- Development of the boot-from-disk toggle, which could eliminate the need for a USB stick.
Checked
12 claims in this story checked against 1 source: 10 supported.
Show each claim
- Partly supportedThe headline says the tool unlocks AI performance on RTX 20-, 30- and 40-series GPUs without qualifying that some models fail or have known issues.Latest from Tom's Hardware: “Compatibility otherwise includes RTX 20-series support listed as “fully compatible; some models have known issues,” while RTX 30-series cards are “fully compatible,” and the tool is “fully compatible on laptops and desktops” using RTX 40-series cards.”
- Partly supportedThe summary says the utility removes the limiter on RTX 20-, 30- and 40-series cards without a VBIOS flash or driver modification.Latest from Tom's Hardware: “The unlocker runs in a firmware stage before the OS loads Nvidia’s GPU driver, which means there’s no need to flash the card’s video BIOS or to modify the driver;”
- SupportedThe open-source tool can boot from USB on Windows and Linux and unlock additional tensor performance on RTX 20-, 30- and 40-series desktop and laptop GPUs.Latest from Tom's Hardware: “A new open-source UEFI tool boots from USB and unlocks significant extra tensor performance on RTX 20, 30, and 40-series desktop and laptop GPUs”
- SupportedThe tool runs before the Nvidia driver loads, so it does not require a VBIOS flash or a patched driver.Latest from Tom's Hardware: “The unlocker runs in a firmware stage before the OS loads Nvidia’s GPU driver, which means there’s no need to flash the card’s video BIOS or to modify the driver;”
- SupportedThe unlock does not persist through power loss and must be run again on each boot; the system must use UEFI, with Secure Boot off or configured to trust a self-signed EFI file.Latest from Tom's Hardware: “the unlock doesn’t “persist through power loss.” The trade-off is running it again on every boot. The system must be booted in UEFI mode with Secure Boot either off or set to trust a self-signed EFI.”
- SupportedThe developer’s laptop RTX 4060 achieved a 65% increase in FP16 matrix-multiply performance.Latest from Tom's Hardware: “the developer’s own laptop RTX 4060 hit 65% higher FP16 math.”
- SupportedOwner-reported results include a 45% gain on a power-limited RTX 4090 and a 91% gain on an RTX 4080 in BF16 calculations.Latest from Tom's Hardware: “RTX 4080 BF16 matrix multiply, 4096 100.37 192.18 1.91x Owner report RTX 4090 FP16 matrix multiply, 4096 118.42 171.52 1.45x (power-limited) Owner report”
- SupportedThe compatibility listing rates RTX 30-series cards and RTX 40-series laptops and desktops as fully compatible, while RTX 20-series cards are fully compatible with some models having known issues.Latest from Tom's Hardware: “RTX 20-series support listed as “fully compatible; some models have known issues,” while RTX 30-series cards are “fully compatible,” and the tool is “fully compatible on laptops and desktops” using RTX 40-series cards.”
- SupportedThe RTX 2080 and RTX 2080 Ti are reported to fail at boot or handoff.Latest from Tom's Hardware: “RTX 2080, 2080 Ti and 2080 Super fail at boot or handoff;”
- SupportedGTX 16-series cards are theoretically compatible but untested, and RTX 50-series cards are unsupported because they have “a lot more security” than anticipated.Latest from Tom's Hardware: “The GTX 16 is “theoretically compatible” with verification pending, but other cards, including pre-Turing, the GA100, and RTX 50-series cards, are unsupported.”
- SupportedLaptop GPUs are supported if the discrete GPU is powered at boot; on Linux, runtime power management can erase the unlock.Latest from Tom's Hardware: “For laptops, the discrete Nvidia GPU must be powered at entry, which means dGPU-only, or MUX, mode is recommended. On Linux distributions such as Ubuntu, runtime power management can power down the GPU when idle and silently erase the unlock.”
- SupportedA developer team member said on Reddit that the tool “CANNOT bypass this requirement” for a game’s anti-cheat that requires Secure Boot.Latest from Tom's Hardware: “For a game’s anti-cheat that requires Secure Boot, the tool “CANNOT bypass this requirement,” a developer team member relayed on Reddit.”