I've kept every computer I've ever built. They all still work. I have almost every generation of x86 CPU. This picture is just of the beige rigs, from 1981 to 2003.
Do you keep your all of your old systems too?
A snapshot of my PCMR origin story:
5x Intel 8088
2x Intel 286
1x Intel 386
2x AMD 386
4x Intel 486
1x AMD 486
1x AMD 586
1x AMD K5
4x Pentium
1x Cyrix MII
1x AMD K6-2
3x Pentium II
4x Pentium III
2x AMD Athlon
6x Pentium IV
1x Athlon XP