The Radeon RX 490 has been already spotted online a few times and there have been quite a few rumors that AMD is working on a new graphics card. According to newest benchmark results, the graphics card, with Device ID 687F:C18, is very close to the Nvidia Geforce GTX 1080.
Dual-GPU Polaris or the new Vega GPU
While it is currently anyone's guess, the mystery graphics card spotted in these benchmarks is most likely a dual-GPU Polaris graphics card and the score is in line with what you would get with two Radeon RX 480 graphics cards in Crossfire. On the other hand, the Ashes of the Singularity benchmark does detect multi-GPU configurations and it did not detect it in these results.
We have already managed to confirm that AMD Radeon Technologies Group should launch its new Vega GPU architecture, with a Vega 10 GPU, sometime in the first half of 2017 with possible briefings sometime this month. Bear in mind that some sources suggest that Vega could launch as early as Q1 2017.
The AMD Vega 10 GPU is expected to hit 24 TFLOPs of half-precision and 12 TFLOPs of single-precision compute performance. It is expected to pack 4096 Stream Processors and come with 16GB of HBM2 memory.
The aforementioned benchmark result might easily be a sample of the Vega GPU, but that would be a big surprise. Results were pulled from the benchmark data site but Techpowerup.com managed to get all the screenshots.
As you already know, AMD is hosting the big "New Horizon" event on December 13, where we expect it to preview its new Zen CPU architecture as well as new AM4+ desktop motherboards and hopefully preview or at least mention a new graphics card.