ReflexCapOverride

A version.dll mod that turns NVIDIA Reflex off in Direct3D 11 and 12 games, even when the game forces it on, and removes the frame rate cap that comes with it.

Not affiliated with NVIDIA.

Warning

Don't use ReflexCapOverride in online games with anti-cheat. Anti-cheat software can flag DLL mods that hook game functions, and your account could be banned.

Why

With G-SYNC, VSync and DLSS Frame Generation on, games force Reflex on, following NVIDIA's guidelines, and Reflex caps the frame rate a few FPS below the refresh rate. With some engines and displays, that cap causes stutter, even with G-SYNC. ReflexCapOverride turns Reflex off, so the cap goes away with it.

It's meant for single-player games, often played with a controller. With Reflex off, input latency goes up. For competitive or mouse-driven games, keep Reflex on.

Features

• Turns Reflex off, Low Latency and Boost included, whatever the game asks for.
• Removes the Reflex frame cap, so your usual frame limiter takes over.
• Optional frame cap applied by the NVIDIA driver, with Reflex still off.
• Works as version.dll or as an ASI plugin, alongside ReShade and other mods.

Requirements

• Windows 10 or Windows 11, 64-bit.
• An NVIDIA GPU and a 64-bit Direct3D 11 or 12 game that uses NVIDIA Reflex. Vulkan is not supported.

Usage

Download the zip from the Releases page, extract it and copy version.dll and ReflexCapOverride.ini next to the game's EXE. If the game keeps its main EXE in a subfolder, copy them next to that one.

Configuration

[ReflexCapOverride]
TargetFPS=0

TargetFPS	Result
0	No cap. Use another frame limiter, such as RTSS in any mode except Reflex, or VSync.
1 to 1000	The NVIDIA driver caps the frame rate at this value, with Reflex still off. Decimals take a dot or a comma, for example 119.877.

• Reflex stays off whatever the value.
• Since Reflex is off at the driver level, frame limiters that rely on it, such as RTSS in Reflex mode or in-game caps built on Reflex, can't work. Use TargetFPS or another limiter instead.
• The file is read at launch. Restart the game after changing it.

To check that it works, set TargetFPS=60: the game should stay at 60 FPS. The game's menu may still show Reflex as on. It isn't: the driver receives Reflex off whatever the game asks for.

ReShade and other mods

Only one file in the game folder can be named version.dll.

• ReShade usually installs as dxgi.dll, d3d11.dll or d3d12.dll. It works alongside this mod as is.
• Another mod already uses version.dll, often an ASI loader: rename this DLL to ReflexCapOverride.asi and put it where the loader picks up plugins, such as the game folder or its plugins or scripts folder.
• An ASI loader is installed under another name, such as winmm.dll or dinput8.dll: the same .asi works there too.

Wherever the DLL is, ReflexCapOverride.ini stays next to the game's EXE. Install only one copy per game.

Uninstall

Delete version.dll (or ReflexCapOverride.asi) and ReflexCapOverride.ini.

Build

MSVC x64 and a Windows 11 SDK, from an x64 Native Tools Command Prompt:

ml64 /c VersionExports.asm
rc ReflexCapOverride.rc
cl /std:c17 /O2 /MT /LD /DUNICODE /I minhook\include /Feversion.dll ReflexCapOverride.c minhook\src\buffer.c minhook\src\hook.c minhook\src\trampoline.c minhook\src\hde\hde64.c VersionExports.obj ReflexCapOverride.res /link /DEF:VersionExports.def /MANIFEST:NO

MinHook is included in minhook\ (TsudaKageyu/minhook, BSD 2-Clause license).

How it works

The DLL forwards every version.dll function to the real one in System32. Once the game loads NVAPI, it hooks two functions with MinHook:

Function	ID	Change
NvAPI_D3D_SetSleepMode	0xAC1CA9E0	Whatever the game asks for, the driver receives Reflex off (Low Latency, Boost, marker optimizations and minimum queue time) and the frame interval from the INI, 0 meaning no cap.
NvAPI_D3D_Sleep	0x852CD1D2	Sends the same settings once per device, in case the game set up Reflex before the hooks were in place.

Everything else passes through untouched. The DLL writes no files, doesn't touch the registry and doesn't use the network.

AI disclosure

This app was built with the help of AI (Claude, by Anthropic) under the direction of the author.

License

MIT, see LICENSE. MinHook is distributed under its BSD 2-Clause license and the NVAPI definitions under NVIDIA's MIT license, see NOTICE.txt.

NVIDIA, NVIDIA Reflex and DLSS are trademarks or registered trademarks of NVIDIA Corporation.