I run 32gb of memory split 12 for pc, 20gb for ramdisk, ramdrive use it for firefox cache, temp files,etc, plus as a work area for photoshop.
Also ram drives are cleared when shutting down, so anything personal is gone for ever, but you can 'Save Disk Image on Shutdown' to your hard disk.
This is my favourite software I use for a ramdisk:
http://memory.dataram.com/products-and-services/software/ramdisk?
Dataram do a free version which allows you to make a 4gb ramdisk, so give a try.
See this thread.
http://forums.overclockers.co.uk/showthread.php?t=18395046&highlight=ramdisk
Also search on this forum plenty of threads on ram drives, ram disks.