AFAIK it is 25MHz. You can't overclock the onboard CPU beyond 25 MHz because the clocks and the dividers which go to the Amiga chipset are only for 32MHz and 50MHz crystals. You can't over clock the Amiga chip set/bus and get good results.
AFAIK you can set the clock divided for the memory independently of the Amiga bus so if you can find 50ns ZIP ram you can run your RAM at 2x speed. This is well documented.
The FPU can also be independently overclocked. But imo why bother. Nothing uses the FPU.
If you want to over clock you need accelerator board
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