Version and / or Patch Used: v4.1
Original Developer: Xavier Gourdon
Product Download: Download It Here
PiFast is a single threaded application that calculates pi with a very large number of digits. While there are newer versions out for competitive benching, version 4.1 is utilized.
The UD9 pushed the CPU to a frequency of 6484MHz to achieve a calculation time of 13.44sec.