What are the specs on the Windows 11 pc?
If you want to stress test the gpu, use OCCT, its free for presonal use and should allow you to see every value that is important, while test runs (gpu clock, power usage, etc...). Try to see if the clock frequency goes up to what is advertised for your card (if it dips down a bit if the card is under heavy load and it's heating up, it's fine, might just need cleaning or cooling pad replacement (do not try the later if you don't have experience with it, ask an expert to help), but if it doesn't go to higher clock speeds at normal temperatures, it might be broken).
Also try testing dgvoodoo2 with other games. The games you mention all run on the older versions of the LithTech engine that are notorious for being poorly programmed (especially Blood 2) and do not perform well in general. Dege has implemented fixes for those games in the wrapper, but they can still run poorly, when I played through Blood 2 on an RTX 3050Ti laptop with Dgvoodoo 2, the game would lag when a fire effect was on screen, even through the gpu was fine.