HOW-TO · RESIZABLE BAR · CHECKED ON DRIVER 621.14
How to force Resizable BAR in any game (and when not to)
First make sure Resizable BAR is on in your BIOS and shows as enabled on your PC. Then, in the game's profile in NPI, set rBAR - Enable (0x000F00BA) to Enabled and apply. NVIDIA's own list turns it on for 58 games and explicitly off for 16, and independent tests show some games gain while others get slower, so test each game and never set it in the Global profile.
You need
- GPU
- RTX 30 or newer
- PC
- ReBAR enabled in BIOS
- NPI
- 3.0.2.1 or newer
- Time
- 10 minutes
Step 0: is ReBAR on in your PC?
NPI can only force the driver side. Resizable BAR also needs your hardware: turn on Above 4G Decoding and Re-Size BAR Support in the BIOS (and leave CSM off on most boards), and use an RTX 30 series or newer GPU. To check, open GPU-Z (the Resizable BAR field) or the NVIDIA App’s system information. We cannot test platforms, so confirm it on your own PC; the board maker’s manual names the exact options. OFFICIAL · NVIDIA, RTX 30 ReBAR
NVIDIA’s own ReBAR list
NVIDIA decides per game: it enables Resizable BAR through driver profiles only for games it has tested, and it also lists some games with ReBAR explicitly off. OFFICIAL · NVIDIA, 30 Mar 2021 We read the list out of NVIDIA’s public driver package 621.14: ReBAR is on in 58 profiles and off in 16. LAB · DRIVER PACKAGE · F43 The table is searchable. A game on the off list is a poor candidate for forcing. The list changes with drivers.
| Arc Raiders | On | not set | not set |
| Assassin's Creed Mirage | On | not set | not set |
| Assassin's Creed Valhalla | On | not set | not set |
| Avowed | On | not set | not set |
| Battlefield V | On | not set | not set |
| Black Myth: Wukong | On | not set | not set |
| Borderlands 3 | On | not set | not set |
| Borderlands 4 | On | not set | not set |
| Company of Heroes 3 | On | not set | not set |
| Control | On | not set | not set |
| Cyberpunk 2077 | On | not set | not set |
| Dead Space (Remake) | On | not set | not set |
| Deathloop | On | not set | 1.5GB |
| Diablo 4 | On | not set | 200MB |
| DiRT 5 | On | not set | not set |
| Dragon Age: The Veilguard | On | not set | 1.5GB |
| Dying Light 2 Stay Human | On | not set | not set |
| F1 2020 - DX12 | On | not set | not set |
| F1 2021 | On | not set | not set |
| F1 2022 | On | not set | not set |
| F1 23 | On | not set | not set |
| F1 24 | On | not set | not set |
| Forza Horizon 4 | On | not set | not set |
| Forza Horizon 5 | On | not set | not set |
| Forza Horizon 6 | On | not set | not set |
| FragPunk | On | not set | not set |
| Frostpunk 2 | On | not set | not set |
| Gears of War 5 | On | not set | not set |
| Ghost of Tsushima: Directors Cut | On | not set | not set |
| Godfall | On | not set | not set |
| Halo Infinite | On | not set | not set |
| Hitman 2 | On | not set | not set |
| Hitman 3 | On | not set | not set |
| Horizon Forbidden West Complete Edition | On | not set | not set |
| Horizon Zero Dawn Complete Edition | On | not set | not set |
| Lords of the Fallen (2023) | On | not set | not set |
| Marvel Rivals | On | not set | not set |
| Mecha Break | On | not set | not set |
| Metro Exodus Enhanced Edition | On | not set | not set |
| Metro: Exodus | On | not set | not set |
| Microsoft Flight Simulator 2024 | On | not set | not set |
| NTE (Neverness To Everness) | On | not set | not set |
| Red Dead Redemption 2 | On | 0x00000001 | 1GB |
| Rematch | On | not set | not set |
| Returnal | On | 0x00000001 | 200MB |
| S.T.A.L.K.E.R. 2: Heart of Chornobyl | On | not set | not set |
| Senua's Saga: Hellblade II | On | not set | not set |
| STAR WARS Jedi: Survivor | On | not set | not set |
| Star Wars Outlaws | On | not set | not set |
| Starfield | On | not set | not set |
| The Finals | On | not set | not set |
| The Outer Worlds 2 | On | not set | not set |
| The Riftbreaker | On | not set | 300MB |
| THRONE AND LIBERTY | On | not set | not set |
| Watch Dogs: Legion | On | not set | not set |
| WitchFire | On | not set | not set |
| World of Jade Dynasty | On | not set | not set |
| Wuchang: Fallen Feathers | On | not set | not set |
| 3DMark PCIExpress | Off | not set | not set |
| Alan Wake 2 | Off | not set | not set |
| Arena Breakout: Infinite | Off | not set | not set |
| Battlefield 6 | Off | not set | not set |
| Delta Force | Off | not set | not set |
| Final Fantasy XVI | Off | not set | not set |
| Grand Theft Auto V | Off | not set | not set |
| Grand Theft Auto V Enhanced | Off | not set | not set |
| Hogwarts Legacy | Off | not set | not set |
| Marvel's Spider-Man Remastered | Off | not set | not set |
| Marvel's Spider-Man: Miles Morales | Off | not set | not set |
| Marvels Spider-Man 2 | Off | not set | not set |
| Monster Hunter Wilds | Off | not set | not set |
| Omniverse-Kit | Off | not set | not set |
| Ratchet & Clank: Rift Apart | Off | not set | not set |
| The Witcher 3 | Off | not set | not set |
Most entries set only rBAR - Enable. A handful also set a size limit, for example 1 GB for Red Dead Redemption 2 (with Options 1), 1.5 GB for Deathloop and 200 MB for Diablo 4.
What independent tests found
We did not measure Resizable BAR ourselves, because we have no NVIDIA hardware. These are published results, each with its own setup, and they disagree, which is the point.
| Publisher | GPU and test | Result |
|---|---|---|
| TechPowerUp (2021) | Four RTX 30 cards, 22 games | Uneven. Only 12 of the 22 games had driver support, and one game regressed at 1080p. |
| TechPowerUp and The FPS Review (Feb 2023) | RTX 4080, Dead Space, forced with NPI | A user went from 76 to 111 FPS in a game NVIDIA had not whitelisted. |
| GameGPU and Tom's Hardware (Jun 2025) | RTX 5090, 3DMark Port Royal, forced with NPI | About 9 percent higher score. A benchmark, not a game. |
| RedGamingTech (2025) | RTX 5090, Doom: The Dark Ages | Essentially no difference in the game, while a synthetic test rose. |
| PC Games Hardware (16 Sep 2026) | On the NVIDIA App toggle | NVIDIA says the effect depends strongly on the game. PCGH advises keeping the driver default and measuring before forcing. |
NVIDIA’s own wording is that some games gain a few percent up to 12 percent and some lose. OFFICIAL · NVIDIA, 30 Mar 2021 REPORTED · E049 to E055
How to force ReBAR for one game
Open the game's profile
Run NPI as administrator and type the game’s name or exe in the profile box. Never set this in the Global profile.
Show the rBAR rows
Search for
rbar. In our lab NPI 3.0.2.1 listed seven rBAR entries with the Reference source turned on; if a row you need is missing, turn that source on in the filter flyout. LAB · UI · F15Set rBAR - Enable to Enabled
The row is ↗; Enabled is
0x00000001· Enabled.Leave Options and Size Limit alone first only if…
Apply, restart and compare
Click Apply Changes, restart the game and compare average FPS and the slowest 1 percent with and without it, using the same scene for about a minute each.
rBAR - Enable v2
NPI 3.0.2.3 added ↗ (rBAR - Enable v2) with the values 0x00000000 · Disabled, 0x00000001 · Auto and 0x00000002 · Enabled, shown from driver 616.56.
CODE · NPI 2994194 We could not test what it changes on a real driver.
Which Size Limit value?
| NPI label | Value (QWORD) |
|---|---|
| 200MB | 0x000000000C800000 |
| 300MB | 0x0000000012C00000 |
| 1GB | 0x0000000040000000 |
| 1.5GB | 0x0000000060000000 |
| 2GB | 0x0000000080000000 |
| 4GB | 0x0000000100000000 |
| 8GB | 0x0000000200000000 |
| 10GB | 0x0000000280000000 |
| 12GB | 0x0000000300000000 |
| 16GB | 0x0000000400000000 |
| 24GB | 0x0000000600000000 |
| 32GB | 0x0000000800000000 |
Reports about the right value conflict: leave it empty so the driver fills it, copy a whitelisted game’s value, or match your video memory. COMMUNITY We have no data to settle it. Our advice is the least invasive choice: leave it empty unless a guide gives a value for your game.
- DEFAULT (NVIDIA driver default)
- not set
- GLOBAL (Global profile)
- not set
- NVIDIA (NVIDIA's predefined game profile)
0x00000001Enabled- YOURS (Changed by you)effective
0x00000000Disabled
ReBAR in the NVIDIA App
NVIDIA App 11.0.9 added per-app Resizable BAR controls under Graphics, Program Settings, Driver Settings. OFFICIAL · NVIDIA app 11.0.9 notes It writes to the same profile database NPI edits, so set the value in one tool and recheck it in the other. NPI vs the NVIDIA App explains the overlap.
Problems
- Rows greyed out, or an error after choosing a Size Limit: early NPI 3.0.1.x builds wrote the QWORD with the wrong type on newer drivers. A fix was merged in June 2026. Update NPI and leave Size Limit empty. COMMUNITY
- Settings reset after a driver update: see the driver updates page.
- rBAR - Intel CPU Exclusion (↗): a driver setting whose exact effect NVIDIA does not document.
Turn it off again
Set ↗ back to 0x00000000 · Disabled or use the row reset, then Apply Changes. Reset NPI settings to default covers every level.
Questions people ask
Does forcing Resizable BAR increase FPS?
Sometimes. One user reported Dead Space rising from 76 to 111 FPS on an RTX 4080, while another test on an RTX 5090 saw no difference in Doom: The Dark Ages. NVIDIA says some games gain up to 12 percent and some lose, which is why it whitelists per game.
Is it safe to enable ReBAR for all games?
Not recommended. NVIDIA turns it off for 16 games in its own profiles, and PC Games Hardware advises keeping the driver default and measuring before forcing it. Do not set it in the Global profile.
What rBAR Size Limit should I use?
Leave it empty unless a guide gives a value. NVIDIA's own profiles set a limit for only a few games: 1 GB for Red Dead Redemption 2, 1.5 GB for Deathloop, 200 MB for Diablo 4.
How do I know if Resizable BAR is working?
Check that your BIOS has it enabled and that the NVIDIA App's system information or GPU-Z reports it. Then compare frame rate in the game with it forced on and off.
Why are the rBAR settings greyed out?
Early NPI 3.0.1.x builds failed when a Size Limit value used the wrong type for newer drivers. A fix was merged in June 2026; update NPI and leave Size Limit empty first.
Sources
- NVIDIA nvidia.com · accessed 8 Nov 2026 · official
- NVIDIA app 11.0.9 release notes nvidia.com · accessed 8 Nov 2026 · official
- TechPowerUp techpowerup.com · accessed 8 Nov 2026 · reported
- TechPowerUp techpowerup.com · accessed 8 Nov 2026 · reported
- PC Games Hardware pcgameshardware.de · accessed 8 Nov 2026 · reported
- NPI issue 464 github.com · accessed 8 Nov 2026 · community