I have a workstation with 16GB of RAM, an 80GB boot SSD, and a software 4x 80GB array for scratch, running Windows 7 64-bit professional. The SSD is slower in sustained throughput than the array (especially on writes). It obviously seeks much faster. I generally use about half my RAM at any point. I've never seen it above 12GB usage.
This is only a question because space is at a premium on the SSD. I've shrank the pagefile to 2GB, but if possible, those 2GB would be nice to have back. Is moving the pagefile to the array going to be detremental to performance?