Despite being to close to the rumored launch date, the site was unable to dig up a lot of information. The Radeon RX 490 will reportedly target 4K gaming and VR gaming, it's said to have a memory bus greater than 256-bit and a price point similar to that of the NVIDIA GeForce GTX 1080.
But WCCF Tech has no definitive proof about what chip will power the card. In fact, it's not even known whether it will be a dual-GPU card, which would point to two Polaris 10 GPUs, or a single-GPU card, which would imply it's using Vega10. Given the timeframe, a dual-GPU model based on Polaris 10 seems to most likely option:
The biggest hint to the nature of the RX 490 comes from these Zauba shipment manifests and one RRA certification that we spotted and analyzed a few months ago. These contained multiple variants, all of whom have been accounted for except one. This variant has not yet been identified and is quite possibly the RX 490. Dubbed the “C99” variant hereon, all of the evidence on it point to the fact that we are looking at a dual GPU solution, probably one based on a full version of Polaris 10.Guess we'll see next month.