www.arnoldrenderer.com/news/press-release-arnold-5-3-gpu/
Autodesk unveiled Arnold 5.3 with Arnold GPU in public beta today. The highly-anticipated release provides artists with a first taste of GPU rendering for a set number of features, and the flexibility to choose between rendering on the CPU or GPU without changing renderers.
Arnold 5.3 with Arnold GPU in public beta will be available for download on March 20, 2019 as of 12 noon PT / 3pm ET.