Welcome to the clan Ramon! CUDA switch can be found consulting this page: < http://docs.info.apple.com/article.html?artnum=58780 > Can't answer your question regarding the comparisons between a Cube at 450MHz and a TiBook at 500MHz, but you should start by adding some more RAM to your Cube. Cubes can handle the maximum of 1.5Gb (3x512Mb), and that will make a lot of a difference ;) LM >>> rgi at tinet.org - 05/04/2005 19:02 PM >>> Hi, I've just bought a cube (450, 256Mb, 20Gb HD) from ebay. My plan is use it as a second desktop machine. I have a linux PC, and a tibook 500 and an ibook 700. I like macs, and the cube has been one object of cult for me. I have not received yet, but the seller stated that it hangs on the grey apple screen. I've been reading the latest posts suggesting to press the CUDA button. Does the cube have the CUDA button? My old B&W powermac g3 had it, but I'm not sure about the cube. How fast would it be compared with my tibook 500 (512Mb ram)? Thanks, Ramon.