Originally Posted by EyeslikeOlives
If it is not that much of a performance loss, yet is more efficient, I think it would be the better choice? I will not be doing anything graphic intensive so I am sure the GTX 650 will be able to handle the games I mentioned as examples (Torchlight/Diablo/Path of Exile/Emulators). Plus, it is also a few dollars cheaper. Just a question though, the mini HDMI connection it uses, will this hinder performance in any way since I would need to buy a mini HDMI to HDMI cable? Or it should be fine?
The 7770 is better if gaming is the sole concern, but it isn't in this case. It's worth giving up a little gaming performance to have good Linux compatibility IMHO. An Nvidia card also opens the door to experimentation with CUDA programming, which is an awesome skill set to have.
Regarding mini-HDMI to HDMI, the only difference is physical; they are are electrically identical and nothing will be able to tell the difference between the two. An adapter or mini-HDMI to HDMI cable will work fine.