Mac Quad & Hard Drives, Track counts Options

[TonyMusic]

I've been trying to look into how many audio tracks at 24/96 KHz can Logic Pro 7 playback (not record) in Mac Quad...and I need about 100 tracks. And I'm totally confused does it depend on the RAM or the hard drives or both. And now before anyone starts to question my need for that kind of amount of tracks, I have to say that I know exactly what I'm doing in that area...what's unclear is what kind of hardware I'm going to need to achieve it.

So 100 tracks at 24/96 KHz...yeah...I have a feeling this is going to set me back. So I'm going to have 8GB RAM update to my mac. And I've been looking into Maxtor Atlas 15K 73,5 Hard drive. Would these two updates in combination be enough to get me that track count. Or is solely depending on the RAM amount?

And another question...I've noticed some discussions on some forums about Mac Quads unability to use in Logig Pro 7 more than about 5GB RAM. Is that true?