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Spoofing

Except from first generation of DLSS2 games they all have some kind of NVidia verifying to enable DLSS option.
To bypass these checks modders have developed some tools.

Windows

Nvapi

For spoofing Nvapi calls, Fakenvapi is used. This is needed for enabling DLSS support for some games (like Shadow of the Tomb Raider etc.).

Also as a big bonus, FakeNvapi adds support for AMD's AntiLag 2 & LatencyFlex to reduce input latency in games that support Nvidia's Reflex.

Tip

FrameBridge bundles Fakenvapi natively. You do not need to download or install it separately. The installer automatically places fakenvapi.dll in your game directory and FrameBridge loads it out of the box when required.

DXGI

OptiScaler have built-in DXGI spoofing option which is enabled by default when working as non-nvngx (not as nvngx.dll).

d3d12-proxy

Alternatively for spoofing DXGI adapter checks d3d12-proxy can be used. This mod reports your GPU as RTX 4090.

Usage

Just place dxgi.dll file next to games executable.

Link

d3d12-proxy

Vulkan

OptiScaler have built-in Vulkan spoofing options when working as non-nvngx (not as nvngx.dll).
Vulkan spoofing by default disabled and should be enabled from OptiScaler.ini when needed.

; Enables Nvidia GPU spoofing for Vulkan
; true or false - Default (auto) is false
Vulkan=auto

; Enables Nvidia extension spoofing for Vulkan
; true or false - Default (auto) is false
VulkanExtensionSpoofing=auto

vulkan-spoofer

Alternatively for spoofing GetPhysicalDeviceProperties checks vulkan-spoofer can be used. This mod reports your GPU as RTX 4090.
Compatiblity is a bit hit and miss, works for No Man's Sky (not working with latest streamline patch) but not working with Doom Eternal.

Usage

Just place version.dll file next to games executable.

Link

vulkan-spoofer

Linux

On Linux with you can use Wine & DXVK's embedded spoofing mechanisms.

DirectX & Vulkan

For DXGI & Vulkan spoofing just create a dxvk.conf file next to game's executable with this content or just download it from here.

dxgi.customVendorId = 10de
dxgi.hideAmdGpu = True
dxgi.hideNvidiaGpu = False
dxgi.customDeviceId = 2684
dxgi.customDeviceDesc = "NVIDIA GeForce RTX 4090"

NVAPI

For spoofing NVAPI with Proton set this envvar PROTON_FORCE_NVAPI=1

Goghor's DLSS Unlocker's

Goghor have created DLSS Unlocker mods for a lot of games which can be found on his Nexus profile.
For example as far as I know for Doom Eternal still only way to enable DLSS is his mod.