Nvidia Geforce Experience can't detect my GPU

[RayLe]

I just installed GTX 780 Ti to my Dell Precision T5600 Workstation. I used Geforce Experience to update driver for it but it couldn't detect my GPU. Then I use "Auto-Detect Your GPU" on Nvidia's website and it couldn't detect GPU as well. Therefore I had to update it manually.

After installing the driver manually, Nvidia still can't detect my GPU. Do you have any ideas?

 

[DerekODwam]

Did you have a GPU in the PC before?
If so did you delete the old drivers before installing the new?

 

[RayLe]

Did you have a GPU in the PC before?
If so did you delete the old drivers before installing the new?

I did have a Nvidia Quadro 2000 in the PC before. I didn't delete the old drivers before installing the new one, is that a big problem? How to completely uninstall the old driver?

 

[RayLe]

Resolved! I followed this tutorial http://www.overclock.net/t/1150443/how-to-remove-your-nvidia-gpu-drivers to completely uninstall all NVIDIA drivers then install it manually.

Thanks Derek!