When will Halo 3 overtake PS3?

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This relates to my prediction on when Halo 3 will pass Gears of War:

http://www.vgchartz.com/forum/thread.php?id=7288

Since GoW is 4.84m and I voted 2 weeks, then 2 weeks it is. So when numbers for Halo 3 are posts next week it will have not only topped Gears, but also PS3 WW.