Found this info. Looks like you can buy SDRAM modules (inc. non-EDO) up to 256 mB. More RAM may help but 233 is slow. The slowest I'll be running is 500 mHz. Got one to retire that's slower than yours.

Mainboard

Processor

CX 6X86/CX 6X86L/CX 686MX/AM K5/... Login to read more.