HDMI 1.0 - Initial Specification. Support bandwidth to 4.95Gpbs
HDMI 1.1 - Added support for DVD Audio .
HDMI1.2 - Added support for SACD Audio. Permitted PC Applications to Use only RGB color Space. Supported low voltage (AC Coupled Sources ) in PCs
HDMI 1.3 - Increases bandwidth to 10.2 Gbps ( 340Mhz ). Offers support for 16 bit Color, increases refresh rates ( ex. 120Hz ), support for 144 p /WQXGA Resolutions. Supports xvYCC Color Space Standard. Adds Features to automatically correct audio video synchronization ( lip Sync ) . Adds mini connector. Adds support for Dolby True HD and DTS HD Master Audio Standards
HDMI 1.4 - Adds and HDMI Ethernet Channel (HEC) which allows for a 100Mbit/s Ethernet Connection between to HDMI Connected Devices so they can share an internet connection, and introduces an
audio return channel (ARC) 3D over HDMI, a new Micro HDMI Connector, expanded set of color spaces with the addition of sYCC601 , Adobe RGB and Adobe YCC601 and an Automotive Connection System. It also defines several stereoscopic 3D formats including field alternative (interlaced), frame packing. With the version 1.4b released in October 2011 it adds the ability to carry 3D 1080p video at 120Hz allowing frame packing 3D format at 1080p60 per eye (120Hz total )
HDMI 2.0 AKA Premium High Speed - Increases bandwidth to 18 Gbps ( 594Mhz ) the increases comes from the maximum throughput from 3.4 Gbps to 6 Gbps . 2.0a added support for High Dynamic Range ( HDR ) video with static metadata. and 2.0b which extends support for HDR.
HDMI 2.1 AKA Ultra High Speed, announced on January 2017, adds support for Dynamic HDR which is dynamic metadata that allows for changes on a scene by scene or frame by frame basis. Also added suportfor eARC. Increases bandwidth to 48 Gbps, The increase of bandwidth is achieved with a maximum throughput from 6 Gbps to 12 Gbps and from 3 lanes to 4 lanes, allowing for resolutions up to 4K120Hz or 8K60Hz.