Afternoon Frank! I have a G4/450MP running Tiger with 1.25mb RAM. It purrs along. It's no speed demon, but it works quite well. I'm running Adobe CS (Photoshop, Illustrator, InDesign) as well as iLife '06, and [granted] there are some spinning beach-balls, but over-all it works great. You don't mention how much RAM you have. OS X is a RAM-hog! If your RAM isn't maxed out, you need to have at least 512mb - at least! You didn't mention which version of OS X you'll be upgrading to... FYI, my G4 has had them all, 10.1, 10.2, 10.3 and 10.4. 10.4 (Tiger) is by far the best running of the bunch. Oh yeah, find out if your peripherals are supported in X. Your printer/scanner may or may not have drivers in OS X. You can check at apple.com. Last but not least, your hard drive... if it's the original drive, you may want to upgrade to something larger. Your G4 will support up to 128gb HDD. And the newer HDD's are much faster than the older ones. You should have plenty of space inside for more drives. You can probably pick-up a 100gb, 7200rpm HDD for $50 - $60 anywhere. Make sure to get 7200rpm. If you have any more questions/comment/problems, drop a line. HAVE FUN - OS X ROCKS!!! On Oct 16, 2006, at 2:05 PM, Frank haddock wrote: > I have a 400MHz G4. Will I experience a slowdown in computer > performance > if I install system X? > > Thanks in advance for opinions and advice. > > frank > > > > _______________________________________________ > G4 mailing list > G4 at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/g4 > > Listmom is trying to clean out his closets! Vintage Mac and random > stuff: > http://search.ebay.com/_W0QQsassZmacguy1984 J. R. Rosen Armadillo Press-Printing & Graphics 305 Wells Fargo Dr., Suite 4 Houston, TX 77090 281-586-9383 (phone) 281-586-9876 (fax) 281-467-5366 (cell) dilloman at armadillo-press.com dilloman at sbcglobal.net dilloman at aol.com www.armadillo-press.com