The 10 Most Influential CPUs of All Time

Intel 4004 - first CPU to integrate all logic in a single chip.

Intel 8080, MOS Technology 6502 & Zilog Z80 - powering CP/M, some industrial gear, early homecomputers & gameconsoles. 8080 regarded as common ancestor for 8086 and Z80 lines.

DEC Alpha - one of the (if not the) earliest 64 bit architectures. Driving design & system performance to new heights in its day. Instrumental in the spread of Unix.

ARM7TDMI - iPod, GameBoy Advance, Nokia 6110, coprocessor in Sega Dreamcast & PlayStation 2. Among many other uses.

Intel 8051 family - powering a plethora of industrial control systems, in some cases to this day. Integrated in many other products.

A variety of RISC architectures like MIPS, Sparc or the new hotness, RISC-V.

Sony's Cell cpu. Very remarkable design in its day. Not to mention its performance (although difficult to program effectively).

VIA/Cyrix C3, the MediaGX and their low power descendants. Powering many thin clients, handheld & industrial PC's.

Almost forgot the PDP series. ;-)

Related like DSPs, uC, Transputer, etc.

That's just of the top of my head. Feel free to add.