Generally speaking, AMD had some more advanced microarchitecture features than Intel, leading to better per-clock performance.
Intel marketing struck back by emphasizing GHz, GHz, GHz. At least until Pentium 4 scaling hit a brick wall.
Then, a chip was sold as a "Pentium 4" "2.8 GHz" (or a "Pentium II" "300 MHz"). No other codes.
By the end of that range, the multicore era had started, and both Intel and AMD had moved to new systems of processor labelling.
Generally speaking, AMD had some more advanced microarchitecture features than Intel, leading to better per-clock performance.
Intel marketing struck back by emphasizing GHz, GHz, GHz. At least until Pentium 4 scaling hit a brick wall.
Then, a chip was sold as a "Pentium 4" "2.8 GHz" (or a "Pentium II" "300 MHz"). No other codes.
By the end of that range, the multicore era had started, and both Intel and AMD had moved to new systems of processor labelling.