Agreed, they only increase the maximum rate for marketing purposes. In reality no IDE drive caneven touch 50MB/s, so ATA66 is still adequate. Even if the channel has 2 devices, they must work in rotation. The burst levels may break ATA66 and maybe eventually ATA133, but this rarely comes into play in the real world. Again back in reality, even 15000RPM drives barely break 50MB/s and dont come close to saturating the SCSI Ultra160 spec. True the SCSI controllers can multitask so more than 1 device can be doing operations at a given time, but you must remember the massive cpu and bus overhead generated by this would grind everything to a halt, not to mention PCI topping out at 133MB/s. There is absolutely no reason to wait for ATA133 or get an ATA133 add-in controller, the drive should work backwards compatible with ATA66 and ATA100.