George, If am reading this correctly, you want to purchase a processor upgrade card for 10.3. If this is correct don't do it. The reason is that according to Apple's website, OSX does not support them. Here is the text and the link. System Requirements for Panther 1. Confirm that your hardware can run Mac OS X Version 10.3 Panther Mac OS X Version 10.3 requires a Macintosh with a PowerPC G3, G4, or G5 processor, built-in USB; at least 128MB of physical RAM and a built-in display or a display connected to an Apple-supplied video card supported by your computer. Mac OS X does not support processor upgrade cards. http://www.apple.com/macosx/upgrade/requirements.html Guy On Friday, December 19, 2003, at 01:23 PM, George Booth wrote: > I have a G4/400MHz with 640 MB of memory & 19 GB hard drive. I am > adding an > Apple 20" monitor and now need OS X.3 for it (been using 9.2.2 only). I > would like like to increase the speed to make photo CDs for family and > speed > up my searching capabilities. Would going to 800MHz be enough & do I > get > another 400 MHz card or an 800MHz (which seems more logical)? I don't > know > what type of speed or memory card to get to eventually be able to make > DVDs. > Thanks, george >