There are two types of best graphics cards when you consider gaming PCs, integrated graphics and dedicated graphics cards. The former is weaker, and usually baked onto the processor chip in the form of an APU or SOC. Dedicated graphics cards, like all of those models listed above, as discrete models that are slotted into your computer's PCIe Express port, most being two-slot, but some taking up three-slots depending on size, to deliver far greater visual prowess. There are two main manufacturers, Nvidia, and AMD Radeon. Nvidia is definitely the most popular, and its GPUs can come in many forms from a lot of different gaming brands out there. Intel is also making its plays into the GPU market with the Intel Arc cards.