There was definitely a "cache enable" pin on the 486 socket. I had a 5x86/133 that had that pin broken. It worked but unimaginably slowly. Wedging a snapped

There was definitely a "cache enable" pin on the 486 socket. I had a 5x86/133 that had that pin broken. It worked but unimaginably slowly. Wedging a snapped off pin from another CPU into the socket and trying to keep the whole mess bodged/glued/soldered together made it usable again.