A spectacular rumor doing rounds has AMD sign 2016 off with a new high-end graphics card launch. The company could launch the Radeon RX 490 by the end of the year, according to an Guru3D report. This SKU could either be based on the larger Vega 10 silicon, or be a dual-GPU on a stick graphics card based on a pair of Polaris 10 "Ellesmere" chips. The former seems more likely as multi-GPU support among recent AAA game launches is dwindling. Earlier this year, AMD inadvertently leaked the SKU name Radeon RX 490 on its website.
If the Radeon RX 490 is based on the Vega 10, then it could feature 4,096 stream processors based on the "Vega" architecture, 256 TMUs, 64 ROPs, and a 4096-bit HBM2 memory interface, holding 8 GB or 16 GB of memory, with a memory bandwidth of 512 GB/s. If instead it is a dual-GPU card based on Polaris 10, then you could be looking at 2x 2,304 stream processors, and 16 GB of GDDR5 memory across two 256-bit wide memory interfaces.