MS FSX doesn't require a powerful graphics card to run at highest settings. It is CPU intensive, as all the frame generation work is done by the CPU. Graphics with 1GB of VRAM is ideal, as more texture storage can improve overall FSX performance. To run FSX on an iMac, the 3.4GHz i7 is the best choice. On my Windows PC I am running FSX off an SSD. FSX loads faster on an SSD, and it does runn smoother. FSX is constantly loading autogen and other graphics which can cause micro-stutters, depending on drive performance, and this is where an SSD helps, but it's not worth the cost of the 768GB SSD. Also, 64 bit Win 7 Pro is the best version of Windows, so far, for running FSX.