Replay1
Currently if you want 100% compatibility and stability it is at 50MHz.
Note: Certain models of the CPU were either made at a faster clock speed in the first place or were more tolerant and stable at greater speeds again. So if you have say a Revision6 CPU then alot of Replay1 users have currently found that they have been able to and successfully set and use there 68060 CPU’s at the 75-80 MHz mark. Other factors involved being that different onboard memory variances etc and from different manufactures can cause inconsistencies across boards of even the same Revision. Currently tho, Software work and Tweaking is still being done on the Replay1 to achieve consistent results at higher clock speeds to reach up to possible speeds of 100 MHz / 110 MHz.
Again tho currently, we do not officially support it beyond 50MHz.
Also note at this time, that the Replay1 Ethernet device is not stable and is not supported over the 68060 CPU set @50/55 MHz max and as such, you may or will see currently unstable results if pushing your CPU past these limits.
Replay2 (Coming soon).