between SSD and ram, theres no real advantage to running a ramdisk, friend compiling a sl client saw at most a 1 minute advantage to running a ramdisk vs using a ssd to do intense read write operations...so no ram disk no.
this was with a sata ii ssd vs ramdisk, on a intel w3550 with 12 gig of ddr3 1333, running VS2010 compiling a linden developer client, on the ssd it took about 23 min, on the ramdisk it took around 21, was not really worth writing home about.