For LAME, the Gigabyte X38-DQ6 performs poorly at the 1066FSB setting, however it performs slightly better than the other contenders at 1333FSB, and tops the chart at the maximum achieved overclock (1800FSB)
TMPGEnc
For TMPGEnc, even the 1066FSB tests for the X38-DQ6 beat the same FSB contenders. It wins at 1333FSB and the overclocked result takes the top spot.
XVid
XVid was not as kind to the X38-DQ6, for some reason - presumably memory performance - it did not do as well as the other boards.