...Thursday, I went and spent over $2,000 on the parts for a new computer. For some reason, I also bought the PMDG 737 NGX Thursday night, and tried it out on my "old" system (Mac Pro with ATI 5780 card). I'm getting 25-30 FPS reliably on the Mac. Here's what I blame PMDG for: The new computer is still in parts in the other room-- I haven't been able to pull myself away from the NGX long enough to finish building the new system! Man, this thing is great (currently at FL 250, enroute KSNA-KSJC)... Kent