So here goes
486DX33 --> 486 DX4-100 --> Pentium Overdrive --> Pentium 166 --> Pentium 200 --> PII 333 ---> PIII 750 --> PIII 1Ghz ---> P4 2.66 --> P4 3.0 HT --> X2 4800+ --> Q6600 --> Q6700 (current)
with each platform change came the associated Motherboard and RAM change
Thats going back from the early 1990s to present day
486DX33 --> 486 DX4-100 --> Pentium Overdrive --> Pentium 166 --> Pentium 200 --> PII 333 ---> PIII 750 --> PIII 1Ghz ---> P4 2.66 --> P4 3.0 HT --> X2 4800+ --> Q6600 --> Q6700 (current)
with each platform change came the associated Motherboard and RAM change
Thats going back from the early 1990s to present day