68030 not running at 25Mhz

[AmiDude]

I guess it divide the clock with 2. So the crystal may have been swapped. What is the speed on the cpu?
(Text on the top of the cpu)

If you have a 16mhz 030, you need a 30mhz crystal. If a 33mhz 030 use a 66mhz and so on.

Nonsense! That counts only for 68040 CPU's.

@ Lurch

Don't put in a 40Mhz crystal! You'll probably burn the 25Mhz CPU. The reason why sysinfo reports only about 13Mhz is that the Cache jumper on the turbocard is probably disabled.
Have a look at the jumper info on http://amiga.resource.cx/exp/professional530plus

Edit:
And do you have any FastRAM memory on the board? If not, then that could be also a reason for the turbocard to slow down. FastRAM memory is essential for speeding up the CPU!

[AmiDude]

So will need to source a 80Mhz crystal ? :-(

Noooooooo! You will vaporize the cpu! :eek:

[AmiDude]

Attempting to overclock a processor beyond its limits won't simply result in it instantly failing...

Chances are it won't do anything with a 40mhz crystal.
Even if it does successfully boot, it won't just magically fail before you have a chance to run sysinfo and see what speed its running at.

Yeah, but he's talking about using a 80Mhz crystal on a 25Mhz CPU.
It's very likely that the Cpu won't survive that. I once stupidly used a 40Mhz on a 25mhz CPU and then the thing was dead.