A recent thread discussed the accuracy of Geekbench and methods by which to establish the performance differences between machines. With that in mind, I put together this test: A 5 second 1080P MPEG4 video clip, converted in MPEG Streamclip to a 640X360 h.264 file. All files are bundled together here (including instructions): https://dl.dropboxusercontent.com/u/8979107/Video Benchmark.zip I've used it on my machines and here are the results with Geekbench scores in brackets: G5 Quad Leopard 7Gb 00:01:59 (3559) G5 DP 2.3 Ghz Leopard 4.5Gb 00:04:56 (1888) G4 1.33 Ghz 12" Powerbook Tiger 768Mb 00:19:04 (722) G4 1.33 Ghz 12" iBook Tiger 1Gb 00:20:52 (706) G4 1.25 Ghz 15" Powerbook Leopard 1Gb 00:12:05 (587) G3 500 Mhz iMac Tiger 512Mb 04:08:39 (301) Most interesting is the 1.25 Powerbook, Geekbench significantly lower than the the other 'Books yet completes the task in nearly half the time. And look at the G3 iMac - what a difference Altivec makes! EDIT: Quicktime 7.5.5 seems optimal for this - 7.7 can lead to nearly double time taken.