That one is a tentative build. I still have some *gasp* floppies for old Star Wars DOS games, which makes a Win98SE machine make sense. Voodoo2's aren't terribly expensive. But honestly, everything I would play from that era was ported to Steam in a functional matter, so I don't think I'll do it. I think my father has a K6-3 550 ACR somewhere, which is gold in the retro market. He probably bought it for $20 on ebay a decade ago. He also still uses DOS Orcad for his electronics drafting, and imports it to modern Windows for everything else.
The real ticket is the games that use EAX, which needs hardware audio and was broken in everything past Win7 since Windows Vista and 10 made hardware accelerated sound obsolete.
The sheet is also useful for what I've learned on this whole vintage gaming adventure. What works and what doesn't, in order to get the best possible experience for games that would wouldn't even run at decent FPS when they were new at resolutions that we would cringe at today. Now they will run at HD resolutions or better, maxing out the game engines, and with hardware accelerated sound, making for a better experience than we ever did then.
For example: WinXP doesn't know what to do with HDMI outside of the original spec, but you can force it to use Displayport to get 1440p and force the refresh rate to what you want. EAX is no problem. Windows 7 can handle all the games in DX11 that destroyed systems at the time, like the original Crysis, but will loaf along with GPUs that have drivers for it still today. A GTX960 is cheap but has all the modern outputs, and is the last card to have WinXP drivers. The Titan Black is the fastest card for WinXP, but the outputs are more limited. Not like it matters for that OS, as everything will be more CPU bound from that era. I intend to play FEAR, Crysis, Doom 3 and Dirt 2 in the older OS'es, but that's about it. I also found a hack to get Dirt 2 to work in Windows 10 since "Games for Windows Live" servers were shut down, which may have made the Win7 rig pointless. Cest la vie.