If the rumors are accurate, the Radeon RX 580 will get a 1340MHz Boost clockspeed, 6.17 teraflops computing power, and versions with 4GB and 8GB GDDR5 memory clocked at 8000MHz effective. Pricing is said to be $199 for the 4GB model and $249 for the 8GB version. If these prices are accurate, the first RX 580 cards may be a bit more expensive than the cheapest RX 480 models that are currently on the market. Clocked at 1500MHz, the RX 580 8GB achieves a graphics score of 6675 in 3DMark Fire Strike Extreme.
Next we have the Radeon RX 570, this one reportedly has a 1200MHz Boost and 5 teraflops of computing power. It will also be available in 4GB and 8GB GDDR5 options, with memory frequency of 7000MHz. Pricing is said to be $149 and $199, respectively. Overclocked to 1325MHz, the RX 570 8GB delivers a graphics score of 5719 in Fire Strike Extreme.
Last we have the Radeon RX 550, a low-end model with 2GB and 4GB versions and pricing of up to $99. This is a low-power card that doesn't require a PCIe power connector, so TDP of under 75W. A graphics score of 1849 in Fire Strike Extreme is achieved with the 2GB model clocked at 1190MHz. You can check out the scores at TweakTown.