I got back into PC gaming a couple of years ago and have been wanting to do some retro builds for some time. I finally have everything I need to proceed with 4 special builds. I am having knee surgery soon and have plenty of time on my hands to play with old junk.

#1 386-486
KLH 386 board and desktop case
Tx486SLC/E at 40MHz
IIT 3C87
8MB RAM
WD 90C30-LR 1MB
Opti 82C931
CD-ROM or 5.25" Floppy, 3.5" Floppy

#2 486
Am486DX4-120
Pine PT-430 Socket 3 VLB MB
48MB RAM (what it came with 🤣)
Boca CL-GD5426 VLB 2MB
Opti 82C931
CD-ROM
3.5" Floppy
DOM
Giant NOS APC dual AT/ATX tower, complete with yellowing.

#3 Pentium MMX
P120MMX at 200MHz or P150MMX at 250MHz (depending on stability)
ASUS P5A MB
384MB RAM
AGP GPU TBD, probably GeForce 3
SB Audigy 2
DOM
3.5" Floppy
CD-ROM
Will be built into the 1999 Compaq Presario mini tower case in which the MB came.

#4 Pentium III Toshiba Desktop Scientific PC
PIII 600
PCI GPU TBD
SB Audigy 2
512 MB RAM
DOM
DVD RW
USB
Ethernet (has a special, quasi PCIe 1x slot just for the ethernet adapter !)

I have numerous PCI and AGP cards from the late '90s and early '00s so with 3 and 4, I am just going to see what works best. It will be neat playing Quake III arena online with period hardware, without period dial-up lag. The adapter could actually be on the gigabit standard since this was originally like a $15k PC but at least 10/100. All this is stuff I missed out on the first time around due to financial constraints. There are about 3 whole years worth of games around the millennium I missed and there are a lot of classics I haven't played since the '90s. Once these are done, I will be looking to recreate the first PC I built:

486DX2-66 at 83MHz
Genuine intel baby AT MB
28MB RAM
Diamond Stealth 64 VRAM PCI 4MB
SB 16 (without bugs)
Creative 4x CD-ROM
15" Trinitron monitor
Creative Multimedia Speakers

I also built an XP rig recently:
P4 650 HT
Gigabyte GA-945GCMX-S2
4GB DDR2-533
GeForce 7800GT
128GB SSD
DVD Super Multi
Early '00s Emachines tower case