jack,
that your seeing is C1E, but yes the celey-l's dont have EIST. as they dont need it at a 35watt TDP, EIST would be better on higher wattage ones. if you really wanted to be "green" you sould undclock/undervolt the cpu to be fast enough for what she does. if its just a web surfing box might as well underclock it.
Indeed, for a web surfing box even 1.8 GHz is plenty. I love how little heat these Cellys give off at stock speeds/voltages, keeps the cpu fan a little over 1Krpms. So quiet.
Also, I'm surprised that this mod worked on a C430. I tried it on my Conroe-L and it didn't work, I had to use a slightly different mod to achieve 1333 FSB. Pretty awesome regardless though, a 3 GHz Conroe-L (especially at stock voltage) is definitely nothing to sneeze at.