It depends on the compression algorithm, the size of the DVD movie, the size of the .AVI and the quality of the end result. But the P4 is like almost a decade old, ANY new CPU whether dual core or quad core will be a massive improvement beyond comprehension. Edit: Actually there are too many variables to consider, but ALOT faster. Edit 2: Personally I would rip the raw DVD straight to the hard disk, the quality will be better and you retain the 5 channel audio as well. OK, it takes up a lot of space but 1 TB hard disks are cheap.