i had two, one from XFX (damn, they used the same board layout for the gf2 mx400, the gf4 mx4000, the gf fx5200 that i have, the gf 6200 and even my pci-e gf 7300le)
and the other from biostar, the problem is that with that bus only old games run great, i had it in a system but I've disassembled because it had the same performance as my "extreme graphics" build (i845gv)

I don't have any problem with cards but the Nvidia win9X drivers newer than 53.04 that crash in direct3d 😐

Yes the GeForce 6200 is compatible with old agp and PCI examples 1: for pentium 2-3 for agp and yes 3.3v x1-x2, and if pentium mmx 6200 PCI but not recomended better (5200/5500) PCI for mmx, the 6200 is able to go from 95 to Windows 7 32 bit, the problem is the rest of the system so let me give you few examples Windows 7 32 bit requires 256 mb for installation (512 to performance decent)and a DirectX 9c gpu as well as sse CPU (GeForce 6 series requieres sse for latest versions) so to resume a pentium 3 450(has sse) with 512 ram and a 6200 agp/PCI Windows xp SP3, and 7 for fun is the top you can also add ssd and DVD+-rw also wifi to Max It out(nfsmw 30 FPS 640x480), now if your system is below that, example 2: a pentium mmx can also reach Windows 7 32 bit with 256 of ram and 6200 PCI (congrats pinball at 12 fps), but as I said at some point the 6200 drives requires sse, so carefull with the driver version, even using XP, below 512 ram start to add tasks to the CPU, so at least 256 for XP, below that win 98se and for gpu if win 98 Max fx 5500(5200) agp/pci.

So if you have an mmx CPU with 128-256 of ram Windows 98se / XP and fx 5200/ 5500, if you have from 256-512 of ram 6200 agp/ PCI "check the driver version"

Also as help for retro system imagine a Network of 10 equal systems playing lan, coop and online and you pretty much will find how to Max It out your old pc 😉