Gigabyte has shown the RX Vega 56, AMD's graphics card based on the Vega 10 chip, which will have the same heatsink in the first instance as the RX Vega 64, but with fewer Stream Processors.
While it is true that we know practically everything about the RX Vega 64, very little is known about the RX Vega 56, practically nothing, since in the SIGGRAPH 2017 only a Vega Nano was shown with a trimmed GPU. We now know that the first RX Vega 56 will have a reference design, the same as the RX 480 at the time or the RX Vega 64. The design is completely the same as the Vega 64, even in size and possibly the power inputs, counting with two 8 + 8pin PCIe power connectors. It only has the Gigabyte sticker on the fan.
The RX Vega 56 will be the graphics developed to combat the NVIDIA GTX 1070. This model of graphics card will also have 8GB of HBM2, while regarding the graphics cores, it has 3584 Stream Processors, much less than those that They carry the RX Vega 64. There is no data on consumption, but it should be smaller, more restrained, which could be a direct attack on NVIDIA's mid-range, which could cause some damage to the company.
Regarding the working frequencies, this graph, according to the filtration, would work at 1156MHz and would reach 1471MHz through the Boost mode. AMD has even decided to give priority to this graphics card, allowing itself to publish the benchmarks of this graphics card before those of the Vega 64. It will be Monday when these graphics have the first published benchmarks and on the price of them, it is expected that these graphics are around $ 399, more or less the change should be around € 350.
Source: VZ

400 € the cheap custom version
That turbine looks noisy.