I bought a Sonnet PCI SATA 1 Controller for my G4 QuickSilver DP 1.0ghz. I put a SATA 3 Toshiba SSD 120GB. For under $100 for both the SATA card (used) and the SSD (new) I thought it was worth the try. I had to format the drive first on my G5 before the G4 could see the drive. After that I loaded OSX 10.5.8 on the drive and have been running it for a few months. The drive shows as a SCSI drive with the SATA controller. Yes it is throttled down to SATA 1 speeds but being an SSD the machine runs really good. So far it has been very stable under OSX. I have not tried MorphOS yet on this machine so I do not know how it will play with MOS.