Here's where I'm confused. I want to put a nice graphics card in for gaming. I know the PCIe x16 slot is a PCIe 3.0 standard, so I am looking at video cards that would use that. I want to give this PC the best chance it can. I would like to install a 6 or 8GB card. But, in using the Bottleneck calculator, it seems that there will be bottleneck no matter what card I use. But here's the thing... i don't plan on running games at their max setting. Probably medium to High, depending on the game. The two cards I am considering is a GTX-1660 Ti (6GB GDDR6, cheaper) and an RX-580 (8GB GDDR5) Can anyone recommend any other decent cards for this? Thanks!