Are you crazy, there is no way you can get it to 4ghz with that kind of temperture.. I overclock my computer from 2.7ghz to 2.9, and the freaking computer wouldn't even turn on..
You can reach 5GHz if you want.. Its called Electro Hydro Phase change cooling... and it works like a dream. However, if you want AIR cooling that is VASTLY superior to other coolers, then I will provide links to both.
ELECTRO HYDRO PHASE CHANGE COOLING: http://www.swiftnets.com/
Then go to
MCW5002-775T™ LIQUID COOLED THERMOELECTRIC ASSEMBLY FOR INTEL® PENTIUM® 4 (LGA775) PROCESSORS under the Thermoelectric Assemblies.