QUOTE(macita @ Aug 5 2008, 10:18 AM)

try to load samples from exs24....with your 2 Gb ram
and my logic wrks more fast on 8 GB then 2 GB (maybe because not nned to swap data on the hard disk) and without problems also with a real mac pro 8 core that i use in studio, the problem appears is if you use logic 7.
When you use samples and plugins check your activity monitor.
For more infos:
http://support.apple.com/kb/HT1041?locale=it_IThttp://discussions.apple.com/thread.jspa?t...8&tstart=90http://support.apple.com/kb/TS1112Logic is a 32 bit application, the only way to use more ram is using EXS VM mode, which is in fact a kind of hack. But since Logic still a 32 bit application, your limit for total used ram with external plugins is 3.2gb AS MAXIMUM (in fact with more than 2gb starts to works a bit unstable)
The only 8gb does in logic (except for exs24) is serve as disk cache, but this is not done by Logic, but by the own Mac Os X disk cache system.
This issue has been widely discussed in Viena Symphonic Library and EWQSL forums. People there used huge libraries and since Logic is a 32 bit app they are force to either lose all the scripts in their sample libraries by converting it to EXS24, or use external hosts via rewire. That way they can have another 3.2gb.
But the MAIN problem working with big sample plugins and more than 2gb in Logic is Logic itself doesn't know when an audio unit is loading a huge sample bank.
Let's say, your Logic process is using 2.8gb ram, now you open Kontatk3 and load a 1gb sound.
Logic doesn't know you are loading so much data, and allows you to start the process, but as soon as you pass the ~3.2gb mark, logic completly crashes (some times it crashes at 2gb).
So, if you work every day with big libreries in AU, you are almost forced to stick with 2gb total system ram, or 2gb + baseline os x memory usage, so you can't accidentally pass the 32 bit limit and crash Logic.
To sum up:
1.- Logic CAN'T use more than 3.2gb (unless you use EXS with VM on as sampler)
2.- Logic CAN be unstable passed 2gb used.
3.- Logic WILL crash passed 3.2gb used.
4.- The only advantage of 4+ gb for music at the moment is serving as disk cache administered by the OS, or using a different host via rewire so that you can have another 3.2gb with that new process.