A slide from AMD’s internal presentation has allegedly been leaked.
AMD Radeon RX 480, 5.5 TFLOPs, 8GB 256-bit
The specifications are rather poor in details, but we are told that the RX 480 (it appears this is in fact the official name for this card) has 5.5 TFLOPs single-precision computing power. Card would be equipped with 8GB GDDR5 memory across 256-bit interface.
The card will be powered through single 6-pin power connector, and judging from the chart it will compete with NVIDIA’s GeForce GTX 970 and GTX 980. The 6-pin power connector together with PCI-Express slot can provide 150W of power, which means Polaris 10 will require less than that.
AMD Radeon RX 480 would support DirectX12 with Async Compute capability. RX 480 will also feature DisplayPort 1.4, full HEVC and HDR monitor support.
The 5.5 TFLOPs computing power would indicate that RX 480 has 2304 Stream Processors clocked at 1200 MHz, but this part is pure speculation at this point.