Some questions to ask:

Is there any old DOS games demanding enough to need L2 cache to run nicely and is CPU speed sensitive? Otherwise, if demanding dos games is not speed sensitive, I'd run these on my PIII 800 machine instead?
If too fast to use PIII 800, since I tried to use PII 233 on a Dell SE440BX-2 and does not boot, I'll check again to confirm later. Keep in mind, if some games is speed sensitive still but demand more video performance to need AGP video card?

How much of performance penalty without L2 cache, I'm running pair of SDRAM PC133 sticks at PC66 memory?
For disabling L1 cache with utility called Setmul?

The configuration:
Intel AN430TX motherboard with YMF719 for sound otherwise, I can use different sound card which I have some on hand: Aztech 2316R based, SB 16 vibra and ESS 1868 for SB Pro 2.0 or older and other choices that games offers.

Choice of: Pentium 200 or Pentium 233mmx, but I can under-clock both to 133MHz, even Pentium 200 can do 100, 90 or 75. Did tests on both processors to see what I can go lower.

External cache 512K can be turned off "L2" in bios.

256MB was what I have in my parts box. I can use disk memory or something to stuff something in upper range so DOS games can see less than 64MB if I leave L2 cache on or off.

Do have wide choice of PCI video cards including FX 5200 128bit memory but no cirrus logic yet.

Thanks and cheers,