I have a Mac Pro with 2 x 2.26Ghz Quad Core processors. I am currently in the process of clustering it with a Mac Pro (2 x 3Ghz Dual Core) using Apple Qmaster that comes with Final Cut Studio. When setting up the 4 core in Qmaster, it gives me the option to select the number of instances (cores) to use during compression. It allows for up to 4 which makes sense because it only has 4 cores. However on the 8 core it allows for up to 16 instances. This puzzles me as I am pretty confident it is only an 8 core system and should only allow for 8 instances. Is there something I don't know about the guts of that machine or is Qmaster mistaken?