http://www.techpowerup.com/reviews/ASUS/GTX_750_Ti_OC/7.html
The CPU is great, but the GTX750Ti is the main bottleneck for gaming.
You can get a great experience gaming, however you'll need to tweak the game settings for each game to optimize for quality vs frame rate.
My GTX680 gets almost exactly 2x the frame rate as the GTX750Ti and I can max out most games, but not all. Especially not Crysis 3.
Again though, there are no games that you can't play, you just need to tweak properly. For example (may want to copy this):
*There are two main methods I recommend for tweaking. One at 40FPS average with VSYNC OFF (can use Geforce Experience to do that if you wish), or run 60FPS using Adaptive VSYNC (or regular VSYNC).
40FPS with VSYNC OFF:
1) Run game and FRAPS
2) VSYNC OFF
3) Force with Geforce Experience or tweak manually
4) Observe you get roughly those results
(Will get screen tearing, but avoid VSYNC lag issues and can run at higher visual settings than at 60FPS)
60FPS with VSYNC ON (or Adaptive VSync):
1) run FRAPS and the game
2) VSYNC OFF
3) Tweak resolution, AA, Shadows etc until you get above 60FPS about 90% of the time
4) Force on ADAPTIVE VSYNC in the NVidia Control Panel for the game ("manage 3D settings"...)
5) If screen tearing is too frequent, lower a few settings such as dropping to 1600x900 or whatever
Adaptive VSync works great (VSYNC ON if can maintain over 60FPS for 60Hz monitor; or VSYNC auto off if you can't maintain that frame rate.)
Adaptive VSync does cause screen tearing in 30FPS pre-rendered cut scenes though. So I use normal VSYNC for games that I'm always above 60FPS, but Adaptive VSync for games that I do drop below the refresh target.