Caporegime
Amd athlon 64 s939 4000. Followed by an intel e6600, q9600, q9550 and my current i7 920 do.
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Was it worth it? Why not just go 1200 to 4400? I'd say a CPU is only worth considering if it at least tipples CPU performance.
Z80 Spectrum
Pentium 200 MMX