I also get 14 layers with 1GB ram disc on Intel.
14 layers in 31ms for Quad 2.66Ghz.
14 layers in 25ms for 8 core 3.Ghz
kindof what you would expect from cpu speed increase.
write an applescript or shell script - to delete files, and copy another batch. control from dmx in cue list. could be done....
http://macscripter.net/
it takes about a minute or so to copy 4Gb - assuming bandwidth from disc of around 50MB/s