Most emulators are (as far as I have found out so far) CPU hungry. This is because they are with all due respect badly written or not what you would call optimised when compared to the original hardware and bios of a console. It's like reverse engineering. It works, but it takes a lot of grunt to get it to run as it was originally designed.
With that in mind what you want to be doing is looking to get a good clock speed on your CPU (3.0GHZ+ for things like Gamecube, PS2 etc) and a half decent GPU. My focus would be on making sure I have a good CPU clock to deal with what is (again, all due respect) a badly written emulator.
Anything under Playstation 1 and you don't really need to worry to be honest. A modern CPU and A modern GPU will do the job fine.
from the looks of it you have an i7 with Hyperthreading. You should be able to overclock that if you have any half decent motherboard. I would. As aletterfromthelostdays says, try Dolphin: Gamecube games, Wii games, etc.
Hyperspin will run on a Pentium 2. it's the emulators you should be focusing on. Hyperspin is pretty basic. XML files pointing to images, video, themes.