I am new here too, just built my first PC 8 months ago to help with school. I am a mechanical engineer at the University Of Alberta, I am the lead mechanical engineer for the ARVP (Autonomous Robotic Vehicle Project), we are a volunteer group that is sponsor funded that designs and builds robots to compete at the robosub competitions.
Check us out-->ARVP.org
(It is a lame website because we don't have anyone to look after for the last 6 months)
I needed my custom pc for running SolidWorks/ANSYS simulations and rendering images, along with gaming on pc (much better than console) which lead me to overclocking all my components to get quicker results.