Im running true nas on a thinkcentre m77

Im running true nas with i think 12 gigabytes of ram, i will upgrade soon, an i just upgraded the cpu to an amd fx 6350 but it seems when i try to run any apps i can maximum run 1-2 apps and thats without nfs or anything else, and i have more free ram, and the cpu doesn't seem to be overloaded at all

So what can i do to get it running better, I currently run it on a hdd but i dont think that would make it just not work