Is there any reason why you're concerned about this chip heating up? The manufacturer has clearly intended it to run that way as it is just a low power network controller. You also risk damaging things if you were to, say, get some thermal paste bridging the contacts and end up shorting it out. I seriously wouldn't bother.
It gets way too warm' causing lock up on errors on the chip!
I think this is better by the size of the heat sink (2side by side) ]url=http://www.frozencpu.com/products/5557/vid-86/Swiftech_MC21_Aluminum_MOSFET_Heatsinks_-_4_pack.html?tl=g40c16s226]Swiftech MC21 Aluminum MOSFET Heatsinks [/url]