fusion forty problems

[A6000]

pyrre wrote:
After removing the sink and the thermal compound, i see that it is a XC68040RC25. The serial suggest that it is supposed to run @ 25Mhz... ant this card is clocked to run 40...
(according to the seller)
How can I slow it down?
Is that a matter of swapping the crystal?
(it is clocked to 56Mhz)

If the crystal is 56mhz, the 68040 will divide this by 2 and run at 28mhz, so its probably not running too fast.

[A6000]

There is no 40mhz version, the forty in fusion forty refers to the 68040, this card was made in 25, 28 and 33mhz versions but I doubt if there were any 25 mhz versions made, they jumped  straight to 28mhz.

[A6000]

Sorry, I was going on information provided by your first link to the amiga hardware database.
One of them is wrong.