Didn't need to post this, but it's here if anyone else needs it or to further discuss it.
After a very long search it seems that the controler is the same as on the A4091, the NCR 53C710, though Lex site says the one on the A4000T is the NCR 53710, so not sure if it's exactly the same. The switches seem to be the same though, and it's good news for me cause that means I have fast scsi disabled and I was getting around 4.5MB/s, not bad that simple scsi! With fast it'll probably get very close to 10MB/s :-D
:pint: