As I know DivX 5.xx codec is available for MAC too. If some MAC user can perform encoding test - DVD to DivX 5.xx and write here results (speed), it would be very helpful. Of course need to give exact parameters of video - origin resolution, output resolution and methode. I can give then results for same parameter video encoded on PC with DVD2AVI, and with G.Knot methode. 128 bit processor in MAC? I think that it is very partially 128 bit... SSE and 3DNow work with much more than 32 bit data.