Xbox One X ARK Survival Evolved To Run at 1440p@30FPS With HDR in Detailed Graphics Mode; 1080p@60FPS in 1080p Mode
http://wccftech.com/xbox-one-x-ark-1440p-30fps-hdr/
ARK Survival Evolved on the Xbox One X will support HDR and two visual modes, including the ‘Detailed Graphics’ mode and the ‘1080p’ mode.
Developer Studio Wildcard detailed the specific Xbox One X enhancements on the official ARK website.