Hi Luis, Per has a good point. I use 4 Gb in my Mac and tha'ts more than enough for Logic 9 the way I use it. I don't use the 64-bit mode yet because not all plugins are compatible and I don't need more than 4 Gb. You won't hear the difference anyway, keep that in mind ;-) -- Sjaak Overgaauw http://premonitionfactory.com/ http://livelooping.be/