[raverbashing]

You're wrong :)

IPCs for 6502 or Z80 (4x "faster" clock but 3-6 cycles per machine cycle) processors were at the count of clock cycles per instruction

Even a measly 386/486 were much faster than that.

Enter the Pentium with the ability to execute 2 instructions in parallel.

IPC count were the big gainers recently as well

[baybal2]

It is still only 20-30 fold at max on average. So much more came from many thousand fold clock speed increase, and much wider execution paths.