https://www.techpowerup.com/reviews/MSI/GTX_1050_Ti_Gaming_X/27.html
The GTX1060 3GB averages 50% faster (i.e. 60FPS vs 40FPS) for games with no CPU bottleneck.
CPU BOTTLENECKING:
This will happen in many games, however the amount will vary from almost NOTHING in some games to significant in some.
As said the VRAM isn't a big issue, especially at the settings you'd choose for 60FPS (or so) gaming. Even if you found out there WAS an issue (which tends to show up as sudden, big FPS drops though that can happen for other reasons) you could adjust your graphic settings such as dropping the AA from 8xMSAA to 4xMSAA.
Having said that, I don't know of many games that would happen in. Chances are it's a complete non-issue right now for you.
So... your choices are:
1) constantly lower FPS in probably every game, or
2) POSSIBLY some FPS drops in a handful of games (which you can address via tweaking the settings).
OTHER:
I suggest you learn how to use Adaptive VSYNC. Here's how I use it for Assassin's Creed Unity:
1) open the game and close it (to add to top of list)
2) NVidia CP-> manage 3d settings-> program settings-> add game
3) select "adaptive VSYNC" then save
4) TWEAK the game settings until you get the best balance of visuals, with occasional drops below 60FPS (if 60Hz monitor) but otherwise maintain 60FPS about 90% of the time
(You may want to have VSYNC OFF then tweak the game settings first until it appears like you are about 60 to 70FPS most of the time... once Adaptive VSYNC is on if screen tearing is too frequent then drop a few settings like MSAA to raise the average FPS and limit the drops below 60FPS.)