Originally Posted by Khaos Phreak
the 16 gb of ram is because im doing 90% in he box mixing and i saw a few video's where using 8gb the track count in logic couldnt go over 38
Track count has nothing to do with the amount of installed RAM, it's about the speed and/or fragmentation of the disk you are recording to. Getting a faster disk or adding more disks to spread your tracks across is what will increase your track count.
On the imac you only have the FW800 bus to add drives to, unless you are willing to take it apart and replace the optical drive with a second hard drive like I did.