one of my buddys brought over his upgraded gigabit G4. we did a few benchmarks with osx 10.4.9 and the results are unimpressive and sickening at the same time! Xbench 1.1.3...136.53s Audio cd-rip...332.08s Ut2004 botmatch..19.8fps overall his machine apppears to be slower than Owc's 1.5ghz mercury extreme. his specs are. 2.0ghz 7447a newertech 1.0gb of ram 80gig 7200rpm hdd dvd-rw ati-rage 128 pro osx 10.4.9 i took a peak at the mercury extreme 1.5ghz upgrade noticed its faster in the 3 categories we tested. is the 1.5ghz really as fast as owc claims?? or is this just marketing? i will not be buying any 7447 upgrades after seeing for my self. it now seems the 1,5ghz Mercury extreme is a good value compared to the higher clocked 7447's.