"The Radeon RX 470 is carved out from the Polaris10 "Ellesmere" silicon that the RX 480 is based on, it features 2,048 stream processors across 32 GCN compute units, 128 TMUs, 32 ROPs, and a 256-bit wide GDDR5 memory interface, holding 4 GB of memory. The card draws power from a single 6-pin PCIe power connector. The Radeon RX 460, on the other hand, features 896 stream processors across 14 compute units, 2 GB of GDDR5 memory across a 128-bit wide memory interface, and relies on the PCI-Express slot entirely for power.
The reference RX 460 board looks quite similar to the Radeon R9 Nano, but features a simpler spiral heatsink under the fan. Despite rumors to the contrary, it looks like Vega is on-course for a 2017 launch after all."