@puzzlezaddict
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You don't really have this issue? I had the same issue with HD Radeon 5700 Series before. Yes it uses more than 2 GBs memory with all expansion packs, even without any cc and mods, it just shows me desktop background without any notice or message on mac side. I had no problem to run the sims 3 Base game only on mac side but I really love many expansion packs. I didn't have this issue with Geforce graphics card. I firstly started the sims 3 with radeon card on mac. I had the same issue with that radeon card, after that, I purchased radeon 5460, and I got the same issue, after that, I got radeon 5700, and it was the same. After using Geforce card, I heard Radeon card shows great performance, so that's why I got this radeon pro 560 but still have the same issue.