A3640 Issues
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The A3640 is Commodore's Motorola 68040 board.  Clocked at 25MHz,
it was never sold in any production A3000 desktop, but in A4000's and a
special version, the A3000T40.  This is because it's too hot.  It is not
as good as other accelerators, which have onboard RAM for faster local
access, fit physically better, and have built in FastSCSI connectors.
This may be useful for nonlinear editing systems.  The A3640 also does not
support burst mode access.

Generally speaking, only revisions 3.1 and 3.2 of the A3640 will
work, requiring Kickstart 2.04 or 3.1 in ROM.  If it's 2.04, the first chip
of the FAST RAM bank must be Page Mode.  If it's OS3.1, Static Column is
recognized and utilized properly.  

The DMAC and RAMSEY versions should be at least -02 and -04.  This
is largely due to heat tolerances.