HDMI 1.3 doubled the bandwidth from 4.95 Gbps to 10.2 Gbps. Here are the results:

Higher Resolution: including up to 1440p already available on some DVD Players.

Faster Refresh Rate: The increase in bandwidth also results in a faster refresh rate for smoother motion. Motion blur often occurs in LCD displays with 60Hz refresh rates (the images refreshes 60 times per second). LCD manufacturers are currently increasing refresh rates from 60Hz to 90Hz and 120Hz based on HDMI’s capabilities.

For gamers, this increase in bandwidth allows for faster response time - which in that world can mean life and death.

Greater Color Depth: One of the exciting features made possible by HDMI 1.3 is the ability to render better color detail for a smoother looking image.

One of the challenges of tradition displays with low-bit color depth is the inability to render contrast. The result is called “banding”. These are the rings most often seen on bright images such as a bright sun. 8-bit color depth (17 Million Colors) is incapable of allowing the needed contrast level.

HDMI 1.3 increased color depth to 10-bit (1 Billion Colors), 12-bit (69 Billion Colors) and 16-bit (280 Trillion Colors) eliminating banding and ensuring smoother images and high contrast ratio.

Broader Color Space: Today's color gamut reflects only a subsection of the colors the human eye is capable of seeing. Because display manufacturers are creating technology to increase the color space within their televisions, a new color gamut is required. HDMI 1.3 incorporated this color gamut to deliver truer, richer colors closer to the capabilities of the human eye. The result (XV Colour) is twice the limits over the common RGB standard.

Lossless Audio: The increased bandwidth enhances the Digital Cinema Experience with Lossless Audio offering digital surround sound with the same fidelity as movie theatres. HDMI 1.3 adds support for Dolby® TrueHD and SDTS-HD Master AudioTM formats. Traditional audio interfaces such Optical and Digital Coax cannot support these formats because of the required higher data transfer rates.

Lip Sync: Lip Sync is a problem where audio and video signals get out of phase with each other. Video signals are generally more complex than audio signals. Limited bandwidth and traditional interfaces can not always accommodate audio signals from being processed quicker than the video signals based on the complexity of the information traveling to the display.

HDMI 1.3 includes automatic Lip Sync timing compensation eliminating lip Sync problems all together.