If you're not noticing a difference from a RAMdrive, you're doing it wrong, sorry to be blunt.
I get over 5GB/sec reads and over 7GB/sec writes from mine.
Stick some apps on there, that's the best thing to do.
I just have a 12GB drive as that's the size of my biggest game, I stick whatever I'm currently playing on there and...wait for everyone else to load in

There are endless uses for a RAMdrive really.