This may up being an endless debate and could even get quite heated at that, but for 2019 and the near future what do you gerbil consider to be the bare minimum dGPU along with the amount of VRAM said card should have? Of course this would also factor in budget considerations as well.
Wasn't that long ago I would picked the 1050 Ti right of the top. But and yes there is a but here, AMD's Rx 570 and 580 graphic adapters that have 8GB of memory are not that much more while Nvidia's new 1660 can be option but I don't know the price off hand.
I agree that 4GB is way better then only having 2GB, but another but here, 8GB might be the new minimum here. Things to consider....
GTX 1050ti was NEVER a good option. They've always been overpriced and custom cards were always $20-30 more than the suggested MSRP, which even by MSRP was expensive, considering the RX 470 and then the RX 570 was 30% and more faster.
The only reason you would get one, was in the middle of the mining craze, those 3-4 months where all 470/570 were selling at $300+.
Even the GTX 1060 6GB was a bad value choice when compared to the RX 580 8GB, the 580 8GB generally outperformed it and cost a bit less. Again the only reason to get 1060 6gb over a 580 was due to those 3-4 months of all AMD cards getting sold out for mining. Nvidia cards, especially GTX 1070 and lower were not that good at mining. Later on some new mining techniques were developed, it made them better, but an AMD alternative card would still perform better.
If you want to play at 1080p with max settings right now, then the bare minimum is GTX 1070 or Vega 56. I'd say from the newest Turning cards the bare minimum is GTX 1660ti, the 1660 is useless, it's basically an overclocked 1060 in a sense(I know its new arch and stuff), but it is essentially OC'd 1060 version on 12nm. Its about 10-15% faster than the 1060 6gb. Which is good, but the 1070 wipes the floor with it and has more vram and you can get it cheaper used.
So in terms of Turing, the bare minimum is GTX 1660ti, preferably the RTX 2060 as it is the full RTX feature spec., has fast GDDR6 memory and essentially can match the 1080 in some games and even beat it in Vulkan games. Pascal was really bad at Vulkan, Turing has been optimized with Vulkan in mind as well.
So yeah, bare minimum GTX 1660ti or 1070, from AMD Vega 56. Right now I think the best value card is the RTX 2060, especially as it comes with 1 free game. So its essentially $300 dollars, just $20 more from the 1660ti, for up to 30% more performance.