The AMD Radeon RX 480 is set to launch on June 29th, but a VisionTek model was published a little early (now unpublished — thanks to our long-time reader, Arbiter, for the heads up). Basically all specifications were already shared, and Ryan wrote about them on June 1st, but the final clock rates were unknown. The VisionTek one, on the other hand, has it listed as 1120 MHz (5.16 TFLOPs) with a boost of 1266 MHz (5.83 TFLOPs).
Granted, it's possible that the VisionTek model could be overclocked, even though the box and product page doesn't mark it as a factory-overclocked SKU. Also, 5.16 TFLOPs and 5.83 TFLOPs align pretty close to AMD's “>5 TFLOPs” rating, so it's unlikely that the canonical specifications slide underneath this one. Also, TFLOP ratings are basically a theoretical maximum performance, so real-world benchmarks need to be considered for a true measure of performance. That said, this would put the stock RX 480 in the range of a GTX 980 (somewhere above its listed boost clock, and slightly below its expected TFLOP rating when overclocked).
There is no price listed for the 8GB model, but the 4GB version will be $199 USD.