Socket 478 Processors
Socket 478 is used by the older Pentium 4 and Celeron socket 478 models. The process of applying thermal paste to those processors is similar to the process for socket 754 and 939 processors.
First make sure the processor surface is completely clean and free from dirt as well as remains of thermal paste from past applications. See Figure 28.
Using a small spatula (which can be made by cutting a piece of the hard transparent plastic from the processor box), apply some thermal paste on the center of the processor. Don’t worry about covering the whole processor area because the cooler pressure will make it uniform. See Figures 29 and 30.
The next step is to install the cooler over the processor.