Power Spec machines are quite nice. A friend of mine has the same one you have, which he got from the Microcenter in Cambridge, MA. They use top-line components in their systems such as AsRock motherboards, G-Skill or Corsair memory, and EVGA power supplies.
Before you go through the trouble of putting a fan on your system, or opening the case, what kind of temperatures are you getting with your system?
Your motherboard, I believe has a utility which will show the system temperatures, including processor temperatures.
EVGA has their Precision X, which you can download from EVGA if you have an EVGA video card. There are other such utilities from other manufacturers such as MSI and ASUS.
What this will do is show your system temps and with that we can see if you're operating in the upper rage. Your video card, for example, needs to be under 83C. If you reach that temperature, or close to it, your video card GPU and components will start to throttle back, meaning slow down to prevent from burning up. Your Intel CPU and other components will also do the same. This is a safety factor so you don't burn up your computer, and is something that has been done with computer components for more than a few years now.