Thanks Unknown_K, this is the same as mine.
From what I've read online, the cache works under OS 7.01 and 7.1 but the enhanced DMA SCSI access does not (AU/X only); which is probably why is results in a hard crash with OS 8.1 currently installed. I will of course try AU/X, but I'm not terribly sure how useful it will be for me - NetBSD though ...
JB