many report being able to go to higher FSBs w/ a better cooler. i replaced the heatsink on my MSI K7T Pro2-A northbridgew/ a blueorb. it didn't seem to make my 1.1ghz Tbird anymore stable above 102mhz FSB and the added 26dBa from the blueorb running all the time didn't seem worth it, so i just unplugged it. was too lazy to take it off and put the old heatsink back on, so i just have the idle blueorb heatsink on there and it still doesn't show any preformance loss from having it on all the time. could just be my chip was a bad OC'er, but it's already pretty much at the max preformance level anyway so it could just be the capped chip.
anyway, YMMV but i didn't see a big improvement.