While integrated video chips are getting more powerful they still fall short when demanding video is required. You have to check all the specs and some of these specs are not listed (for obvious reasons). The big problem is the video frame buffer size. The minimum requirement for TS3 is 128mb. Many business/student computers with integrated video chips have 0 to 64mb of dedicated video memory and this seems to cause problems with TS3. While many video chips will run the base game there are some very demanding expansion packs.
I do not work for EA nor do I have any association with EA. I am a gamer helping other gamers.
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I'll give you think link to where it was mentioned: http://forum.thesims3.com/jforum/posts/list/724950.page
Also here is a chart of i think all the graphics cards: http://modthesims.info/wiki.php?title=Game_Help:TS3_System_Requirements