MTEC Viper 1230/28 RTC: Problems underclocking 68882 FPU?

[Djole]

I have the same accelerator and a 50mhz crystal in async mode. It would be more useful if we could overclock the cpu to 50mhz.

[Djole]

Hi all,
I recently acquired an MTEC 1230/28 RTC without coprocessor. I bought one yesterday, PLCC package, 40MHz. I plugged the coprocessor trying 14MHz and 28 MHz configurations, but the Amiga 1200 won't even boot. From what I can understand, there is no need for an oscillator clock if one goes by one of those frequencies, so is it possible that the 40MHz FPU doesn't like being underclocked? Do I need a 40 MHz oscillator?

Thanks,
Antonio

Do you have 4 or 8mb in it ? I just have 4, would like to get 8... somewhere.