Hereafter is a report from Marc:
I want to report the result of my experience with SSDs. I installed two Intel MX25-E 64 GB (OS) and one Intel MX25-M 160 GB (iTunes library etc.) in my Mac Pro Nehalem. I was so please by the result that I decided to install SSD in all my Macs.
So, a Vertex 250 GB (firmware 1.30) found its way in my MacBook Pro (2006), and here again I was amazed by the performance gain for booting, opening applications and overall responsiveness. In my PowerMac G5, I installed a Vertex 60G (firmware 1.30), and... no real improvement of performance, only a slightly more responsive interface. As I was having a APM partition, I repeat the experience with a GUID setup. The volume does not appear on the bootable unit, nevertheless the computer boots but no improvement. After trying different options, it turns out that a SSD in my PM G5 does not provide a faster system volume than a Raptor 150, while on Mac Intel SSD units help the system to run amazingly faster. I looked on the web, and could not find any report of SSD installed on a G5.
Without getting access to the PM G5 we do not have any explanation for such probleme. We know that the SATA format in PM G5 was not always behaving as expected, and some HDs could not be installed. So, if you have installed SSD on a PM G5 and have carried out some performance tests, we would be happy to hear about it in order to define if the above report is an unfortunate issue, or if there is a general issue with SSD and PM G5.