1a. Pentium 166, 16 MB EDO Ram (NEC Ready pre-built)
1b. Pentium 200 with MMX, 32 MB EDO Ram (Upgrade to NEC Ready)
2a. AMD Thunderbird ~1.2 Ghz, 512 MB of DDR Ram (Custom order PC from ABS Computers in their earlier years)
2b. AMD Thunderbird ~1.2 Ghz, 1 GB of DDR Ram (Upgrade to ABS Computer)
3a. Pentium 4 3.2 Ghz HT with 1 GB of DDR2 533 Ram (One of last "high-end" Compaq pre-built computers before HP pushed the name to budget status)
3b. Pentium 4 3.2 Ghz HT with 3 GB of DDR2 533 Ram (Upgrade to Compaq)
4. Pentium 3 800 Mhz with ? MB of ? ram (IBM Thinkcentre recertified business desktop, bought to be an "old Win 98 SE/DOS gaming machine")
5a. Core 2 Duo E6750, 2.66 Ghz <oc: 2.8 Ghz stock cooler>, 2 GB of DDR2 1066 running at 700 Mhz (Custom build by self)
5b. Core 2 Duo E6750, 2.66 Ghz <oc: 3.1 Ghz with aftermarket cooler>, 4 GB of DDR2 1066 running at 775 Mhz (Upgrade to custom build)
All of the computers are still capable of running. Present status:
1b. In closet, but will be connected to network in new house with number 4 for Master of Orion 2 network gaming. (MoO2 doesn't TCP/IP network under any OS after Win98 SE) It has a wonderful Voodoo 2 PCI 8MB add-on graphics card for 3D graphics.
2b. Given to my mother as an Internet/Home office machine. (Running with 768 MB of ram due to one chip burning out. Has a GeForce 4 MX graphics card.)
3b. At a friend's house as a spare computer.
4. See 1b, above.
5b. My current gaming PC, with 9800 GT / 8600 GT PhysX graphics.
My wife has a computer very similar to my current gaming machine that was custom built, and her previous computer (pre-built Dell with a Pentium 4 3.0 Ghz with DDR ram) was recently dismantled for parts. However, she tells me stories of her first computer actually being a some kind of early PC clone that could only play 16 "preset" games.