The Radeon RX Vega 64 is the full GPU with 64 CUs, this card will reportedly be shown at SIGGRAPH this weekend. It will ship in an air cooled version as well as a liquid cooled edition with a higher TDP, similar to what AMD did with the Frontier Edition. VideoCardz claims the Radeon RX Vega 64 cards will arrive in August but that they won't hit shelves "anytime soon"
There will be no reference model of the Radeon RX Vega 56, this model has 56 CUs and will only be available from AMD's add-in board (AIB) partners. The bad news is this version won't ship until September.
Spanish-language tech site ElChapuzasInformatico came across three SKUs from Sapphire:
Lastly, there's also an unverified rumor from Reddit about a retailer listing of an ASUS Radeon RX Vega 64, 8GB, HDMI, DPx3 (RXVEGA64-O8G-LIQUID) with an August 2, 2017 availability date. This model reportedly costs 1,115EUR ($1,350) without VAT.SAPPHIRE RADEON RX VEGA 64 8G HBM2 HDMI + TRIPLE DP, LIQUID COOLING 2048-bits – Water Cooler SAPPHIRE RADEON RX VEGA 64 8G HBM2 HDMI + TRIPLE DP LIMITED EDITION 2048-bits – 2 slot active SAPPHIRE RADEON RX VEGA 64 8G HBM2 HDMI + TRIPLE DP 2048-bits – 2 slot active
As always, take this with a grain of salt.