How to install the Nvidia proprietary driver in CentOS
Installing nVidia driver under CentOS & Red Hat 6.0 Specifically post #10 within that topic says that the poster got rid of his nvidia drivers with the following steps - remove blacklisting of nouveau NVIDIA FX4800 The Nouveau driver ships with CentOS, enabled by default. It's this If you want Nvidia, then you will have to remove this driver first. This can
Install NVIDIA Drivers in RHEL/CentOS/Fedora and Debian
Need to get rid of Nouveau, use the correct NVidia drivers, and://oracle-noob. Blogspot. com/2011/10/install-nvidia-drivers-on-centos-6.