This is a great idea, and with recent Firestorm update (RAM HOG) this makes even more sense. Problem is this, you go to crowded club and you can watch your ram rise and rise. Till it starts writing to page file(harddrive). Then at that point you have 2 things desperately thrashing your harddrive, 1 Firestorm paging to page file and 2 Firestorm writing everything to cache. Which at this point overwhelms the system, M2 harddrive or not.
To solve this simply download a free ram drive software. Then dedicate 1/4 of your ram to it. Then put all Firestorm cache files on it.
This does 2 things, it relieves the harddrive when you reach peak ram useage and it starts writing to page file, and it makes everything in cache load much faster.
This is a win win.