Thank you for that.
This makes sense, I think; the implication being that the extra RAM might even slow some types of processes down, in some cases (which are multi-threaded)? In any case, it can't be worth the extra dollars.
Here's my idea: I can use my MacBook Pro to run Cubase, a 32-bit host, and port via Vienna Ensemble to this system, 8 cores, we'll say the 24GB RAM, as the slave, hosting vstis, and then as a post production studio.
What I use is Kontakt 3.5 currently, some VSL (more to come since I like the articulations control), and BFD2. The former two will run at 64-bit.
I wouldn't be real concerned with running out of memory, I'm not doing a giant string orchestra or all these articulations all at any one time. And I approach composing/orchestration and mixing at different times, these are different tasks to me. The decision I make now depends on how VE Pro will deal with 32-bit vstis. That I think is my one caveat as far as using the MacBook to sequence from, with this one machine as the only slave.