They don't finish the GI calculations at the same time. They're completely independant. I realized there is one more significant difference in my machines which is the OS. Machine 1 = XP Pro, AMD 2.4, Nvidia Video, home built, "server" Machine 2 = XP Pro, AMD 1.4, Nvidia Video, home built, "Node 1", matches server. Machine 3 = XP Home, AMD 2.4, Video unknown, emachine off the shelf, "Node 2", Results do not match. -Kix

-Kix