1. Always use version 4.78 of Speedsys. Your version is obsolete.
The graph shows a drop of the "moving" line after 256KB, so the cache is active, no worries. You may tighten the cache timings in the BIOS to see a higher difference between the L2 cache and the memory speed. Maybe Speedsys will detect the cache when the difference is bigger.

2. Download the program "cachechk" for a way better analysis of the cache(s) in your system. Download available from here: http://www.minuszerodegrees.net/software/software.htm
3. Once the lithium barrel battery is empty you can remove it and easily solder a CR2032 battery holder to the available solder points.

Btw. nice find with the onboard cyrix. looks neat. The chipset is a relabeled Acer ALi Finali. Quite a good performer.

I used that cache utility and it says "This machine seems to have one cache? cache is 16kb --199.4 MB/s 5.3 ns/byte (405%) 1.8 clks" "If you think you do have L2 cache, you might have Fake Cache chips"

I don't understand why it says that?

Here is the updated speedsys with 4.78

Is your turbo switch in the correct position?

BTW, I've never seen a standard AT motherboard with a soldered Cyrix 5x86. That's super cool!

I am bench testing it so I don't have the turbo switch on it. Thanks, when I saw it I had to have it 😁