I used to upgrade every 2 or 3 years. I had a 486, P100, PMMX 233, PII300, Atlhon X2 3600, and i7 920.
I still run the i7 920. A decade later, it is 50% as fast as the fastest new CPU on single thread, -that's comparing a decade old, budget i7 against a high end new CPU.-, and I would not...