you are about to have a LOT of problems !!!
CentOS 6.5 shipps wit hthe OPENSOURCE "nouveau" driver installed
you can NOT just install the nvidia.run driver !!!!
you must blacklist the nouveau driver and REBUILD !!! the "boot image"
--- FIRST ---
then and only then can you install the nvidia.run driver
this is very well documented in the redhat documentation
( centos6 uses the redhat docs on the redhat web site)
you can PORT this fedora 20 guide for use on RHEL/Centos 6
you can also port these two ScientificLinux posts
for use on CentOS 6
and a script to rebuild the boot image from my post here
your BEST bet is to install the epel repo on Cent and use yum to install
see the centos wiki:
and install the "kmod-nvidia"
yum install kmod-nvidia
the nvidia.run is a pain in the "rear end" to install