Paul, The 2 things that I found an 800 Mhz is useful on is for CD conversion to MP3 and for DVD conversions from DVD to MPEG4. To convert a movie from DVD to a CD, it can take 20 hours on a 450 mhz but this is cut down to 5-6 hours on an 800 Mhz Athlon or PIII. The Athlon seems even faster than the PIII. John The NOSPIN Group provides a monthly newsletter with great tips, information and ideas: NOSPIN-L, The NOSPIN Magazine Visit our web site to signup: http://nospin.com