I have a PowerPC G5 Dual 2 GHz. It had 2GB Ram when I got it and it continually froze when I worked in Photoshop, etc. I just upgraded to 5GB Ram and it's still freezing. It seems to be running a bit 'faster' back and forth in programs and all that. But all I had open was Firefox and Photoshop...and it froze working on a pic. Any advice?