Benefit of DMAC04 in A3000

[matthey]

Benefits are stability with accelerators. If you have no turbocard you probably wont see any difference.

I have seen exactly the opposite in a 3000 with DMAC 4 and Ramsey 7. It was stable with faster memory access without an accelerator or with 3640. This chip combo does not like some accelerators though and will cause SCSI checksum errors and possibly crashes. I replaced the old chips and everything was fine. This was with AmigaOS 3.9 and my hunch is that it may try to set the fast Ramsey mode if these chips are detected but it doesn't work with all configurations. It may work fine with 3.1 but with less speed where the fast Ramsey mode has to be set manually. All my theory though.

[matthey]

@alexh
I have the latest version of the SCSI chip in all my 3000s. The SCSI chip and Buster 11 are nice upgrades for a reasonable price. The Ramsey 7 and DMAC 4 upgrade is over rated IMHO. I am aware of the insane prices the DMAC 4 brings. Thanks.