Frame Rate Concerns

Yep.
VSYNC ON:
- eliminates screen tearing
- but adds lag/sluggishness

VSYNC OFF:
- causes screen tearing
- less sluggish

There are arguably reasons to go ABOVE 60FPS despite the fact you can't likely draw more than sixty frames per second. That's solely down to latency (responsiveness), and if you go high FPS in some games the screen tearing isn't that obvious so you have to decide what the goal is.

People playing CSGO for example (twitch shooter) may turn VSYNC OFF then run the game at 200+ FPS.

Other solutions include:
a) FAST SYNC:
- no screen tear
- GPU runs as fast as possible (i.e over 180FPS)
- screen still uses VSYNC
- *only draws the latest frame from the GPU that can be DRAWN on the next refresh, so all other frames are ignored
- must output at least 2x the Hz rate (i.e. at least 120FPS on 60Hz monitor) for this to work
- **Meant for fast games that you don't want screen tearing

b) Adaptive VSYNC:
- auto turns VSYNC ON and OFF
- I use for a few games such as Assassin's Creed UNITY
- *At VSYNC ON (60Hz) the game runs at 60FPS, but if your GPU can't output 60FPS then VSYNC turns OFF automatically. The reason is that usually screen tear is preferable to the added STUTTER caused by VSYNC ON if you can't maintain the FPS (frame time variance means stuttering)
- my rule of thumb is no more than 10% of time drops below 60FPS (60Hz monitor) with Adaptive VSYNC. If screen tear is too often, drop some game settings to raise the average FPS

To FORCE the above two:
NVidia Control Panel-> manage 3d settings->...-> add game-> (choose setting)-> save

Then use FRAPS or in-game FPS Counter from Steam to verify the FPS. For example, with Adaptive VSYNC it should show 60FPS, no screen tear but then if it drops below 60FPS you should see some screen tear. If so, working properly.

SUMMARY:
Maybe copy this somewhere as it's confusing, then keep in mind. The optimal game experience requires you to tweak each game towards your goal. If VSYNC ON 60FPS is your goal, and cranking Ultra settings is solid 60FPS then great, you are done. Otherwise you need a plan.