So we can identify if it's an hardware limitation, or an OSX missing feature. If anyone can check if that feature is working on a bootcamped windows, it's quite easy to check, even on Intel website there are some tools. There is still a test to do, does anyone has bootcamp ? What we can deduce now? we have 2 options:Р”РЋ-Turbo Boost is working but the performance improvement is very very low (i don't believe that!)Р”Сћ - TURBO BOOST IS NOT WORKING, yeah, that's the right one!!!Р”Сћ - remove all false advertising you have on your papers. There are 2 results in the window, the first with HT, the second without. I've launched 4 tasks of LAME simultaneously (well, i have to press enter 4 times so it's not exactly simultaneously СЂСџв„ўвЂљ )Р”Р„s you can see the encoder took about 4 seconds more to encode, but it's due to the fact that HD is working 4th times more, and also L2 cache, RAM and bus are shared so it's normal that 4 tasks take a bit longer than just 1. So to demonstarte that Turbo Boost isn't working i've done another test. So basically until now we can only say that Third one is with HT off and only 2 CPU activeР”РЋ-single threaded applications works better when hyperthreading is off, and we all already know that.Р”Сћ -running with only 2 cpus instead of 4 does not affect performanceР”Р€ -running with only 1 cpu get even worst results (that is normal cause in the same cpu there are also system tasks)Р”В¤ - There are no changes in performance even if i disable CPUs manually. Look at the image there are 4 tests conescutively.Р”Р‡irst encoding is done with everything default, 4cpu + hyperthread I'm using also 'processor' and 'cpupalette' taken from the xcode tools. I 've tested encoding a 800MB wav to mp3 using LAME mp3 encoder, that is a single thread application

I have just installed osx 10.6.2 on a fresh new hard disk and updated everything to the lastest version

Ok i'll show you the last test i've just done.

Mac what is turbo boost