ReflexCapOverride

A version.dll mod that turns NVIDIA Reflex Low Latency off and puts you in control of the Reflex frame limit in Direct3D 11 and 12 games.

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. Reflex then caps the frame rate a few FPS below the refresh rate. With some engines and displays, a cap below the refresh rate causes stutter, even with G-SYNC. ReflexCapOverride removes that cap, or replaces it with your own value, for those cases.

It's meant for single-player games, often played with a controller. Turning Reflex Low Latency off adds some input latency, which is hard to notice there. For competitive or mouse-driven games, keep Reflex as is.

Features

• Forces Reflex Low Latency off, whatever the game asks for.
• Replaces the game's Reflex frame limit with your own value, or removes it so your usual frame limiter takes over.
• 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 Reflex frame limit. Limiters that don't use Reflex (game engine, RTSS, VSync) keep working.
1 to 1000	Reflex frame limit at this rate. Decimals take a dot or a comma, for example 119.877.

• Reflex Low Latency is always off.
• Limiters built on Reflex, such as some in-game caps or RTSS in Reflex mode, are replaced by this value.
• 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. That's expected.

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 Low Latency, Boost, marker optimizations and minimum queue time off, and the frame interval from the INI.
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.