Refer to this thread to see which laptop spec's would be adequate for Sims 3.
http://forums.thesims.com/en_US/discussion/635124/laptop-graphics-card-information-zone-calling-laptop-simmers-for-a-survey-laptop-help-here/p1
Sims 3 does not perform well with an integrated graphics card. In order to get the best performance you will need a dedicated graphics card. However there is a chance that Sims 3 (base game only) will run on if all settings are put on low.