NVIDIA X server settings
Let's start with the most obvious attempt to find out NVIDIA driver version by runningNVIDIA X server settings
application from your GUI menu. 
System Management Interface
Use command line and consultnvidia-smi
utility to reveal NVIDIA driver version: # nvidia-smi Fri Dec 25 16:49:12 2015 +------------------------------------------------------+ | NVIDIA-SMI 352.63 Driver Version: 352.63 | |-------------------------------+----------------------+Please note that both above solutions will work only if the actual NVIDIA module is loaded.
Check Xorg X server logs
Another place where to find NVIDIA driver version is to consult Xorg X server log files:# grep "X Driver" /var/log/Xorg.0.log [ 10.295] (II) NVIDIA dlloader X Driver 352.63 Sat Nov 7 20:29:25 PST 2015
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Retrieve module version
If all above commands fail because you are unable to load NVIDIA module you can always see NVIDIA version number by directly retrieving nvidia.ko module version usingmodinfo
command. The below command will check for NVIDIA driver version under your currently running kernel: # modinfo /usr/lib/modules/$(uname -r)/kernel/drivers/video/nvidia.ko | grep ^version version: 352.63The above will work even if NVIDIA module is not loaded. Run the below command to locate your
nvidia.ko
module file: # find /usr/lib/modules -name nvidia.koAlternatively, run
modinfo
command on all results returned from find command: # find /usr/lib/modules -name nvidia.ko -exec modinfo {} \; filename: /usr/lib/modules/3.10.0-229.20.1.el7.x86_64/kernel/drivers/video/nvidia.ko alias: char-major-195-* version: 352.63 supported: external license: NVIDIA rhelversion: 7.1 alias: pci:v000010DEd00000E00sv*sd*bc04sc80i00* alias: pci:v000010DEd*sv*sd*bc03sc02i00* alias: pci:v000010DEd*sv*sd*bc03sc00i00* depends: drm,i2c-core vermagic: 3.10.0-229.20.1.el7.x86_64 SMP mod_unload modversions parm: NVreg_Mobile:int parm: NVreg_ResmanDebugLevel:int parm: NVreg_RmLogonRC:int parm: NVreg_ModifyDeviceFiles:int parm: NVreg_DeviceFileUID:int parm: NVreg_DeviceFileGID:int parm: NVreg_DeviceFileMode:int parm: NVreg_UpdateMemoryTypes:int parm: NVreg_InitializeSystemMemoryAllocations:int parm: NVreg_UsePageAttributeTable:int parm: NVreg_MapRegistersEarly:int parm: NVreg_RegisterForACPIEvents:int parm: NVreg_CheckPCIConfigSpace:int parm: NVreg_EnablePCIeGen3:int parm: NVreg_EnableMSI:int parm: NVreg_MemoryPoolSize:int parm: NVreg_RegistryDwords:charp parm: NVreg_RmMsg:charp parm: NVreg_AssignGpus:charp