Tom's Hardware takes a look at the Alphacool Eisblock GPX-A
A quote from the article:
AMD's Radeon RX Vega stands to benefit greatly from water-cooling, given its high power consumption. The Alphacool Eisblock GPX-A effectively draws heat away from the card's warmest components, silencing its fan in the process.Alphacool Eisblock GPX-A Review
AMD's Radeon RX Vega 56 runs cooler than the flagship Vega 64. However, it's still a 210W card that enthusiasts like to overclock. This makes it a perfect target for water-cooling. Plenty of options abound for integrating Radeon RX Vega into a custom loop. Alphacool, Aquacomputer, EK Water Blocks, Watercool, and XSPC all offer Vega-compatible full coverage blocks.