The directions are for how to get 4 SATA devices with none of them in a raid config.
The promise controller works very well and very easy for RAID setups, getting it to work as an IDE setup is much more difficult and where people have problems
You can, in fact, get 4 SATA devices (In a non-RAID config) on the P4C800E-Deluxe.
It requires updating your BIOS, changing some BIOS settings, managing your hardware settings in windows and moving some hardware around. But honestly, it's not that hard...... Once you actually figure it out...