My problem was the conflicting reports on the length of that PSU. I read on some websites with the power cables it would be 9". Being that the Corsair air 540 is a 'strange' shaped case i wanted to know for sure. Also with this being my first build i really wanted to nail it on the head on my first try. So no, the simple arithmetic was not that hard. Was it hard to be so condescending, or does it come natural to you?