I'm sure there is an easier way to get this, but if you have a dead officeconnect cable modem lying around, there is a heatsink on a chip inside that is the perfect size for a southbridge sink (Very low-sitting, and about 0.2mm sticking out on any side of the southbridge. I put one on my board and it gets pretty warm. With a little airflow directed at it, I got my FSB back up to 230 from 223 (lost it with a bios update awhile back)