a few years ago i used a program amigaamp (i think) it was a PPC program i used on a Blizzard PPC 270Mhz. this blizzard had a very fast bus speed with memory setting set on the card set to no-read/write waitstate and so in the memory config everything turned off.
playing DVD was almost perfect it skiped about every 2-3 seconds using a SCSI DVD rom 10x.
but things have moved on and things have improved a lot and now it's 320MHz or 322Mhz with 80MHz bus. this new speed may get rid of some or maybe all of the skipping. the PCI has also gone up in speed from 25Mhz to 35Mhz. so if i have time i will set-up my old 3.9 system and test again,but i think it's all going to come down to how the SCSI works at this new speed if it shows any errors.