In my Quake 2 software-rendering benchmark the Pentium MMX 233 scores between a PR300/75FSB and a PR333/83FSB. I guess the PR300 will generally be satisfactory. ALU intensive apps/games will run faster on the Cyrix and FPU intensive apps/games run better on the Pentium MMX.
I haven’t specifically tested Unreal or Half-Life (they are FPU bound, too) but I’m guessing they won’t be far off from the Quake 2 benchmark. Quake DOS runs far better on the MMX. The PR300 is about as fast as a Pentium 150.
For the sake of not going mainstream I would choose the Cyrix. With overclocking you can probably get more performance with the Pentium MMX but since few people run the Cyrix it would be nice to take the Cyrix for a spin. Of course you can try running the Cyrix at 83FSB as well 😀.
thandor.net - hardware
And the rest of us would be carousing the aisles, stuffing baloney.