Yup, I just upgraded to a Phenom black edition 9600 quad core and it halves or better the time it took to do the same job with my 939 4600 dual core I just retired. Of course the memory is faster as well now and I also am test driving win 7 but it a fairly decent increase in speed.
It used to take me about 45 minutes to convert a 1080i capture to hd-dvd on dvd and now it takes about 14 minutes including burning. Doing the same thing to blu takes about 4 or 5 hours and also takes up more disk space, but it used to take about 8 hours to do one of them.
A Intel chip would probably be even faster still but I got a great deal on this setup