Hi all! Thanks for those answers! So... apt-getted xscreensaver-gl. gears -fps -delay 0 indeed is the most straightforward app. to show the difference. Left monitor, with the GeForce4: 155 fps. Right monitor, with RIVA TNT2: 50 fps. Quod erat demonstrandum! Hugo __________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com