I'm glad there's some interest! I dug up one interesting overview while putzing around on googling during some downtime at work:
http://www.milosoftware.com/mike/scsi_ide.html
I was originally thinking in terms of some Western Digital(?) drives with stamped aluminum covers I'd been wanting to replace with clear vacuum formed copies for the heck of it in a clear cased hack. ISTR having them in IDE and SCSI and I might even manage to find them . . . or not. :
In reading a few articles about the differences and wondering about what to benchmark, I came up with the notion that trying to match the drives, even with adapters still wouldn't be a true test. No two are created equal in either flavor. Even if you use the same IDE drive on both buses with and without the likes of an ACARD adapter, there must be some overhead involved.
Since we have faster, more modern drives available that will swamp both types of controllers in every category, wouldn't that be a better test? I'm not big on benchmarking, but so long as the cache on each drive were to be equal, wouldn't such drives be better at beating the snot outta either type of controller? Rotation speeds would naturally need to be the same, would any other factors be relevant?
Would that be a fairer comparison of the interface capabilities on the IDE and SCSI buses in a 630 or 580? I'm not sure that a 475/580 comparison would mean anything at all really. The only case where such might matter would be if Apple chose a lower grade SCSI controller for its first rev IDE machines. Chip ID would tell that tale.
ISTR there being Blackbirds shipped with SCSI Adapted IDE drives from IBM, unbeknownst to buyers. Did anyone ever even notice a difference?
http://www.milosoftware.com/mike/scsi_ide.html
I was originally thinking in terms of some Western Digital(?) drives with stamped aluminum covers I'd been wanting to replace with clear vacuum formed copies for the heck of it in a clear cased hack. ISTR having them in IDE and SCSI and I might even manage to find them . . . or not. :
In reading a few articles about the differences and wondering about what to benchmark, I came up with the notion that trying to match the drives, even with adapters still wouldn't be a true test. No two are created equal in either flavor. Even if you use the same IDE drive on both buses with and without the likes of an ACARD adapter, there must be some overhead involved.
Since we have faster, more modern drives available that will swamp both types of controllers in every category, wouldn't that be a better test? I'm not big on benchmarking, but so long as the cache on each drive were to be equal, wouldn't such drives be better at beating the snot outta either type of controller? Rotation speeds would naturally need to be the same, would any other factors be relevant?
Would that be a fairer comparison of the interface capabilities on the IDE and SCSI buses in a 630 or 580? I'm not sure that a 475/580 comparison would mean anything at all really. The only case where such might matter would be if Apple chose a lower grade SCSI controller for its first rev IDE machines. Chip ID would tell that tale.
ISTR there being Blackbirds shipped with SCSI Adapted IDE drives from IBM, unbeknownst to buyers. Did anyone ever even notice a difference?