If you are asking about the memory, then for 11gR2, a minimum of 2G Memory per node would be needed, just for the installation. Ensure that you at least have 6G of memory on the base OS.
The above memory would only ensure that a 2 node system can be setup, but it may hang or crash, so you will not be able to do much activity.
Vandana - Oracle
You can read RAC Attack recomendations to install RAC on your laptop: