Hi WesleyT2.
When you ask such a question it all really comes down to what resolution you intend to play the game titles you wish on your system.
And also what Graphics detail and FX levels you also want to run your chosen game at.
As a rule the higher the intended screen resolution set and the graphical effects enabled withing a game requires the graphics card to have a larger storage capacity of GDDR 5 memory on it in GB.
The sad fact is you also need a more powerful Gpu chip in a graphics cards model range to be able to run the set screen resolutions and graphics settings.
And that is why you see much like the GTX 1060 Nvidia card you have has a maximum of 3Gb or GDDR 5 memory fitted to it.
But a GTX 1080 Nvidia card having...