3.37GHz @ 1.468v is getting pretty toasty for the stock Intel cooler. It may have been throttling at that speed for a few of the benchmarks.Since they overclocked it to past what a stock x6800 chip runs on fsb it is kinda weird it still loses to it in games.
The Xbitlabs used a better cooler and their slightly higher (vs Anandtech) overclocked 4300 was faster than the X6800 in their two game tests.
http://www.xbitlabs.com/articles/cpu/display/core2duo-e4300_6.html