2 questions:
Define "smooth" for you. 60FPS locked about every second?
What's your preferred graphical settings for games? Low, Medium, High, Ultra?
Afaik, a 950 is a decent budget card for 1080P gameplay at most. You can stay above 40FPS most of the time depending on your visual presets, but don't expect things like all High Settings, 60FPS 24/7 with that card especially if you want to play games from the past 1-2 years. Even cards like the 970 are best suited for 1080P 60FPS gameplay so I honestly don't expect a 950 to run at smooth FPS all the time.
But since I'm still new to this whole thing, I would take my words with a grain of salt.