Sorry, sometimes I get distracted at home and overlook parts of the responses.
Quake timedemo1 320x200
Cyrix 5x86-100-BTB = 14.3 fps
AMD Am5x86-133 = 14.5 fps
Pcpbench VESA Modus 100 640x400 8bpp LFB
Cyrix 5x86-100-BTB = 7.4 fps
Am5x86-133 = 7.7 fps
Doom timedemo3
Cyrix 5x86-100-BTB = 42.8 fps
AMD Am5x86-133 = 47.1 fps
3Dbench v1.0
Cyrix 5x86-100-BTB = 83.3
AMD Am5x86-133 = 83.3
My settings are probably different from Phil's, but you can still get an idea for the comparative results. In tasks which are heavily FPU-dependent, the Cyrix 5x86-100 will excel by about 15%, even with 33 MHz less speed. For ALU-dependent tasks, the Am5x86-133 leads by about 15%.
Plan your life wisely, you'll be dead before you know it.