>any ideas on why overclocking would affect this?
Heat... an overheating CPU will cause problems, up to and including a computer that just stops when a sensor in the CPU tells the power supply to shut down
You need a REALLY good CPU cooler to overclock, as well as LOTS of case fans to push room air into the case and out the back
This is NOT with an overclocked system, but the i7 3770 computer I built for my wife in November has 2 optional case fans (front & side) and her temps are CPU 84F & Drives 77F & ATI card 91F and that is with using a stock Intel CPU cooler
Encoding makes the CPU run hotter anyway, and overclocking just adds to that
