1992: Intel 80286
1994: Intel 80486DX2
1995: AMD K5-75
1996: Cyrix MediaGX, Cyrix 6x86MX-PR200
1997: Cyrix MII-300, AMD K6-2 350
1998: AMD K6-2 350, AMD K6-2 450
1999: AMD K6-2 500, AMD K6-2 550
2000: AMD K6-2 550, Intel P!!!-500
2001 to present: AMD K6-2 500, AMD K6-2+ 533, Intel P!!!-500, Intel P!!!-533EB @600EB
No plans of upgrading yet. hehehehehe! =)