Gtx 1060 VRAM??
With 3GB you will be hitting VRAM limit most of the times in 1440p with post 2013 games. Not every game, of course, but its a trend, and will be worse with time.
Industry seem to be targeting 4gb VRAM, but this is not to say having less will necessarily be worse, if that was the case then a 1050Ti should outperform 1060 3GB in games that actually need more than 3GB of VRAM and it's not happening. Sadly, this is highly dependent on the game.
Theory says games should pull from RAM the rest of what they need, since PCI e x16 has about 15GB/s speeds, they should stutter, but you never know how bad it will be until you play. Maybe the game texture streaming is terrific and you never notice. Maybe the game handles like shit this VRAM shortage and you start see popping, stutter and micro freezes. Who knows.
There are many cases of games asking for too much doing too little about it like CoD Advanced Warfare. It will fill 8GB VRAM with ease but if you only give 2GB it behaves exactly the same... making us believe it "reserves" the VRAM even if it does not need to make USE of it. Other games like Doom or Mirrors edge, stutter like hell or refuse to let you set it past certain texture quality as a security measure. I remember Brian from techYesCity having serious texture downsampling while playing with 4GB VRAM GPUs agains 6 or 8GB VRAM gpus. This case is out of scale i know, but take it just as an example of what may happen.
For future re-selling price and "proofing", just don't buy the 1060 3gb, it was not meant for 1440p. 580 8GB would be nice if we could actually find any at a reasonable price.

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