Ryan covered the improvements over the previous Polaris based cards the RX 580 offers, a higher Rated Clock and standardizing memory frequency of all RX 580 models to 8GHz.  That lead to the expected increase in performance compared the the RX 480, in a marketplace somewhat different than what the first Polaris chips arrived in.  Consumers now know what NVIDIA's current generation cards provide in performance and prices have settled as much as can be expected in the volatile GPU market.  Those using cards several generations old may be more receptive to an upgrade than they were with the previous generation, especially as the next large launches are some time off; we shall see if this is true in the coming months.

One particular reason to consider upgrading is VR support, something [H]ard|OCP covers in their review.  The improved speeds do not provide miracles in their VR Leaderboard however they do show improvements in some games such as Serious Sam, with reprojection rates dropping markedly.

"AMD is launching the AMD Radeon RX 500 series today, and we lead with a custom retail Radeon RX 580 GPU based video card from PowerColor. We’ll take the Red Devil RX 580 Golden Sample video card through the paces and see how it compares to the competition at the same price point."

Here are some more Graphics Card articles from around the web:

Graphics Cards