Fallout 3: that seems to be a CD/DVD not found problem. Unfortunately I don't have the original CD version of the game.
I get that compatibility warning (Win11) too but the game just runs fine with or without dgVoodoo. With dgVoodooo you have to select the GF 9800 virtual card otherwise the game crashes when entering a gameplay (the same as with Fallout NV).

I also tried TRU but I didn't have any glitches:

Do you get different results when running TRU through DX11/12?

I used 2.86.5 for both games.

Well everything is working great now.

TR Underworld: the only thing that made those glitches disappear was Direct3D 12 (feature level 11.0 or 12.0). I also remember that with dgVoodoo 2.86.5 I was having some frames drops and stuttering. All I can remember doing between then to now is shutting down my computer overnight, as I usually just put it to sleep. That might have fixed everything.

Fallout 3: working great now. The shutting down may have fixed this game as well. I do own the CD version but have been using a "no cd patch" since the beginning. Only dgVoodoo 2.86.5 gave me those pop ups and the game wouldn't start but all is good now.

Thank you for the tip on using the GF 9800 virtual card for Fallout 3 and New Vegas. I have especially encountered game crashes on New Vegas. I can now run New Vegas with great graphics/speed and better control than using dxvk.

Question: do you suggest using GF 9800 as default or the dgVoodoo Virtual 3D for other games?

Again, thank you for everything you have done.

Great, thanks!

algeeba wrote on 2026-02-17, 21:18:

TR Underworld: the only thing that made those glitches disappear was Direct3D 12 (feature level 11.0 or 12.0). I also remember that with dgVoodoo 2.86.5 I was having some frames drops and stuttering. All I can remember doing between then to now is shutting down my computer overnight, as I usually just put it to sleep. That might have fixed everything.

I had a guess... I asked about it because I have an old AMD card in my old machine (R7 360) and when I played Tomb Raider 2013 through the DX9 renderer on that card I got similar (actually worse) glitches with it (DX12).
It's fine with other vendors and also through AMD DX11, so it must be something in the driver. 😐

algeeba wrote on 2026-02-17, 21:18:

Question: do you suggest using GF 9800 as default or the dgVoodoo Virtual 3D for other games?

Actually yes, you can use it by default (the GF 9800). Just watch out for setting a large amount of VRAM for that card if you set large in-game resolutions (UHD, 4K and the like).

The things that turned out to cause problem with the default dgVoodoo virtual card are:

• this card combines the capabilities of all the others, but certain games do not like if they do not get an "expected" capability list
• this card returns empty (0) Vendor / Hw Id's and a custom driver name ("dgvdumd.dll") but certain games expect a well-known vendor (NV/AMD) with a known driver name (nv_disp4, atiumdag) (like Fallout 3/New Vegas)
• this card supports the D32 depth buffer format which can confuse some games so rendering glitches can occur (missing z-buffering, shadows)

Fallout 3/NV, TimeShift, Overlord 2, Rayden 3, those are that suddenly come to my mind.