Switch to nvidia proprietary graphics?

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http://forums.fedoraforum.org – How do I use the proprietary graphics for my nvidia card? I use KDE, and I've installed both kmod-nvidia and akmod-nvidia, and when I went to activate the special affects I ran into problems. I had to use Xrender for it to work at all (and that just went really slow) whereas OpenGL just made my screen go black, with a mouse and window borders if I alt+tabbed. I reinstalled and only have the default video driver installed (nouveau or something like that) and I'm a bit scared to try prorprietary graphics without a step-by-step guide that works, which I haven't been able to find. I don't think the drivers switched the first time. Can someone help me? (HowTos)