The most recent drivers from NVidia had serious issues. You'll want to visit NVidia's website and get the latest though, just for testing purposes. If you're using Mandrake, you'll want the Uniprocessor i686 version, there's 2 files, the GLX and the Kernel files, they're standard rpm's and there is also install instructions on Nvidia's webpage, give those a shot and if you need further help let us know
...speaking of video problems with nVidia, I have a slight issue with my video. I got an HP which has an Intel integrated graphics with nVidia G-Force engine. I install Mandrake 9 and it correctly picks up the video card, but when I hit the GUI, my monitor displays "Set PC to 1024X768 60Hz. upon investigating, when I was playing with my video settings in Mandrake Control Center (not the KDE one, but the Mandrake one), I could go under Hardware>Monitor and change that, but I was able to get the refresh rate down. It stays pinned at 85Hz. The only remedy I found was to (once Mandrake was set up and under KDE) switch to the nVidia drivers. There, I only have 800X600 at 16 bit color. How do I remedy that? If no one knows, it isn't anything really major, but I would like to fix it. I'm also a Linux rookie, making it even harder.
Lectra you're looking at a function of X itself. If you have installed the NVidia drivers as opposed to the generic open source one's that come with X you should be able to get all the performance that your card supports, if you're using the generic one's you might not get OpenGL support but you shouldn't have refresh rate issues. I suggest looking in /etc/X11/X11R6/XF86config I believe if the config file for Mandrake.. this is where your video information is being passed to X to startup your session (aka the GUI). You can control the refresh rate/size of the screen/ ect ect from this config file, edit to suit taste and then restart X to effect the changes.
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