2nd Mac Mini was an Intel Core solo 32bit 1.5Ghz with 256MB ram, but it was really easy to upgrade it to 4GB and drop in a Core 2 Duo 2.67ghz, as it was so easy to do, as it was all socketed, and had 64bit support even though it was a 32bit chip. Like apple always do though, they locked that model out of upgrades after Snow Leopard for no reason, but a few alterations to a few kexts and it lasted til Mountain Lion and was still unnoficially supported til 2012. Not bad for something that was released in 2005 as a budget mac.. It was also the first intel mac too, you could get the intel mac mini and they were still selling powerbooks, ibooks and G5 iMacs and Mac Pros... Think the iMac was the second one to go full intel.