Hi Dave, I'm running 10.5 on mine but it has a dual 1.5Ghz processor board - PowerLogix - which I bought from Other World Computing a good while ago. The install went without glitches, updates too. It runs pretty well and almost as fast as on my G5 single processor iMac but without some of the graphics enhancements. 10.5 won't install on a stock Cube without some devious work. I think someone else on this list may have done this but don't know who. Steve On 9 Jul 2009, at 22:48, Da Pen wrote: > Can anyone tell me if they are running OS X 10.5 on their Cube? > Thanks. Dave >