Streaming is usually very heavy on CPU, and somewhat on GPU, but I am talking about SSD there, you need write speeds if you are working on stuff like video editing, huge file transfering, audio production, 3D modeling, RAW texture editing and etc.
That RAM is fine, you can get a faster RAM if you are left with some money after you are done with major parts, I think you might have problems with that PSU and Haswell processor, you need an Haswell ready PSU if you want power savings to work properly.