Right, silly me. It will still take a relatively strong system to run well. I just thought he was asking if it was compatible with Win7.
Especially if you want to max-out the game graphically; AND especially if you're gonna run it say zoomed-out a bit, at times. Performance can drop; especially if there's A LOT going on, on-screen.
Plus, like most Sims series games - the camera sometimes just can be sluggish, no matter what.
Regardless, I love Sims 3. I've always loved Sims series - but I really-really love Sims 3. While Generations is a little more subtle w/ how it integrates more stuff into Sims (as it drops more features and options here and there), I really liked the type of content Late Night and Showtime brought to the table.