Are you sure it slow disk access issue? RAM is pretty fast.
Not sure about that, but I doubt it as I have an SSD and I think that would usually stop problems like that?
GTX 560 SE
8GB 1600MHZ Corsair RAM
Gigabyte B75M-D3V Mobo
Samsung 840 120GB SSD - OS
Seagate Barracuda 750GB - Storage