Roel,
I already set max memory usage in Ivory 2 and Superior Drummer, the drum sampler has full bleed on and around 2 GB in memory. Ivory runs with no voice restrictions, all available layers and half-pedaling on pulling around 300 voices in some passages. Machine doesn’t break a sweat at 24/48 and 128 buffers…
I could start a 16 GB RAMDisk, and use that for an audio recording location, but where I live, we have frequent power outages and I don’t have a backup battery (yet)…
Thanks for your thoughts though, I guess I just have to use more VI’s !!! 
Cheers,
Benji