A few weeks ago, I was mentioning that I was considering a CPU upgrade. I have now done that, and I wanted to mention the following single benchmark that I made. I went from a 233Mh Pentium 1 to a 2Gh Pentium 4. I used DOS 4DOS under DOS 6.22 on both machines. (Sorry, Rich!) I was told that the P4 emulates 16-bit applications slower than the original Pentium does, so I didn't know what increase in speed I'd get. There was an 858% increase in CPU processor speed for the two machines, but what would be the increase in Fractint calculation speed? I ran an arbitrary precision mandelbrot on both: Pentium 233Mh: 0:37:44.42 (2264.42 sec) Pentium 4 2Gh: 0:06:04.33 ( 364.33 sec) or a 621.53% increase speed for the Fractint CPU time. The ratio of the Fractint speed increase to the CPU speed increase is .7244, the penalty for running a 16-bit application on the P4. This ratio is higher than I expected, and I do get more than a 6-fold increase in Fractint calculation speed. But what if I had upgraded to an AMD Athlon? I would like to know what this ratio would have been for that! Lee Skinner