There is a special utility from Microsoft: DynCache.exe

1) Copy DynCache.exe to %SystemRoot%\System32.

2) From a command prompt, run:

sc create DynCache binpath= %SystemRoot%\System32\DynCache.exe start= auto type= own DisplayName= "Dynamic Cache Service"

3) Import the DynCache.reg registry file. This registry file contains default settings that you will probably want to modify.

Here it is the whole discussion

2008R2 memory caching