(I wrote this post originally in Japanese, but this post may be helpful universally, so re-write in English.)
I got a new PC with NVIDIA GeForce GTX 750 Ti in December 2014.
At that time nvidia-current did not support GTX750Ti, so I needed to install drivers from nvidia website. However, some tweaks were needed to get things done, so I drop a note how to install NVIDIA drivers without much pain.