FINAL CONCLUSION OR TL;DR:
Have I proven that there is no difference between single vs dual channel RAM? No, I have not. However, I probably have proven that in (most? I can't count 2 games as most can I?) games, video and audio encoding, there is zero (negligible? near zero?) performance gain to be had in faster RAM.
DRAW YOUR OWN CONCLUSIONS.
Check out the following test someone did, here is their conclusion:
http://www.reddit.com/r/buildapc/comments/1fcs77/discussion_ram_single_vs_dual_channel_speed/