Originally posted by: Accord99
Actually, you should be able to overclock the Dell 8300. Use cpucool from:
http://www.podien.onlinehome.de/CPUCOOL.HTM
Select "I don't know" when it asks for MB type. Then under "Functions-> Change front side bus/change CPU speed" and pick the ICS 952607.
Then pick the "Fine Tuning Option" and increase the CPU speed in "fine1" set of options. I've tried this on a Dell Dimension 4600 and the overclock was confirmed with CPU-Z, increased benchmark scores in Cinebench2003 and Cachemem.
Of course, since you don't temperature and voltage readings, and ability to adjust voltage and memory settings, you have to take care when overclocking.
Credit goes to:
http://www.aaltonen.us/forums/viewtopic.php?t=572&sid=b20bc86d0f056977805b27383a00dfab
which figured out the right options to use for Dell systems.