Morrowind released mid 2002:
Minimum : Pentium III 500, 128MB (256MB for 2000/XP), 32MB D3D card (TNT2/G400/RAGE 128)
Recommended: Pentium III 800, 256MB, 64MB VRAM (GeForce 2/3/Radeon 8500)
Honestly, the minimum requirements should have been the recommended ones.
Even fast Pentium 4 machines (1.8-2.0GHz) with 512MB RAM and a GeForce 4 had a rough time with this game. It seemed to be way more taxing on the CPU and RAM than on the GPU.
Ultima IX released late 1999
Minimum : Pentium II 266, 64MB RAM, 8MB VRAM (Voodoo 2/Riva 128/G200)
Recommended : Pentium II 400, 128MB RAM, 16MB VRAM (Voodoo3/TNT2/G400)
The game was super buggy upon release and only worked properly with Glide. D3D was still a mess after a few patches and the game remains sluggish.
Outcast released mid 1999
Minimum : MMX 200, 32MB RAM
Recommended: PII 300, 64MB RAM
These seem generally ok, however this is a strictly software rendered game thanks to its voxel technology. So anybody who thought they could skimp on a better CPU and just buy a powerful GPU got the short end of the stick. Maximum supported resolution was 512x384 and you'd need far more powerful CPUs than those available at the time of release. Tried it on a Coppermine 1GHz once and it still had frame drops, so I'd say Tualatin 1.4GHz and 128MB RAM to truly max this, otherwise, gem of a game.