Hello, Lately there seems to be a very serious VRAM Allocation Issue with dxvk/vkd3d and even native vulkan applications. It seems to push the VRAM usage towards it’s absolute limit(much much higher than anything on windows) and even enabling DLSS(which if you compare windows to linux it does NOT …

Yes I notice it as well with Indiana Jones in 4K, Path Tracing and Ultra textures (so far the game consuming the most VRAM), using a 5080, with 16GB VRAM. Mangohud reports I flirt above 15GB. Using Wayland I need to close all applications (e.g. Firefox) or even use a dedicated light compositor such …

If you have a game with DX12 and DX11. you can compare the VRAM with same graphic settings. VKD3D uses over 1GB, 1.2, or 1.4 more than DXVK. May be someone can check if this is the case in Windows. If Window don’t have this case, it means VKD3D is using excessive VRAM. But I already asked VKD3D de…

You can’t compare VRAM usage like that, It’s two different APIs. It’s true what they say that the games allocate what they want, sometimes things go wrong and it’s often a game issue and if they can the devs work around it in vkd3d-proton. There are similar workarounds for some games in the Nvidia…

I don’t think you get the meaning here. We all know there is an issue in the context of Linux VKD3D. That is why you can compare. DX11 and DX12. I believe we all don’t think DX12 have excessive VRAM to a point is unplayable, or frame drops, but that is the case Linux, unplayable. When you have 4GB V…

I stand by what I said. Two different APIs, yoiu can’t compare those. What you can do is disable DXVK-NVAPI for that game and see if it changes. It could be that the game needs a driver or vkd3d fix too but the only way to tell is to check how it runs on Intel or AMD GPUs with DX12 enabled.

if you stand by what you said, then why there is even this thread about DX12 using more VRAM? Everyone says DX12 through VKD3D is using more VRAM, more than which? of course DX11 DXVK.

To making a point clear, in the view of programming. Of course you can compare API. Both DX11 and 12 are graphic API. It cannot be, that a newer API uses more VRAM to a point the game is unplayable. What if you use Vulkan instead? the game is not unplayable in Linux, because you don’t need translati…

Actually, the thread was about a regression in the driver that caused general VRAM issues in both dxvk/vkd3d and Vulkan, this was fixed. Then the thread turned into something else. And no, I still don’t think you can compare DX11 and DX12 the way you do. There are too many differences going on in t…

Whatever you think does not change the basic knowledge. API is not written from scratch with every version. DirectX version is only feature difference. When you do not use newer features, they are the same. Why do you think games can include both DX11 and 12? The game look the same using either ve…

Let’s agree to disagree. I checked the game you mentioned, F.I.S.T. Forged in the Shadow Torch. VRAM usage seems normal to me, the reason that it’s a bit higher in Linux is because other running applications take some of the VRAM. Textures also loads fine as you can see. Linux: [fst-linux-dx12] …

VRAM Allocation Issues

Graphics / Linux Linux

hurikhan77 January 24, 2026, 4:05pm 88

It’s not RAM sharing that they need to implement, that already exists. It’s RAM eviction that they need to implement, so the driver would migrate idle/non-idle or performance-critical memory dynamically back and forth between device-local and host memory.

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VRAM Allocation Issues

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