UVD is short for Universal Video Decoder. With proper 3rd party software like WinDVD or PowerDVD you can enable support for UVD (2) which provides hardware acceleration of H.264 and VC-1 high definition video formats used by Blu-ray and HD DVD. The video processor allows the GPU to apply hardware acceleration and video processing functions while keeping power consumption & CPU utilization low.
You will have sheer decoding precision on both the HD 4850 and 4870. Low CPU utilization whilst scoring maximum image quality. One improvement has been made as well; you can now for example upscale your 1920x1080 streams fine to a 2560x1600 sized monitor (no more black borders).
New in the GPU architecture of the series 4000 is an updated video engine. It's not much different opposed to the old UVD engine, yet has two new additions for post-processing, decoding and enhancing video streams. Dual stream decoding is one of the new features. For example, if you playback a Blu-ray movie and simultaneously want to see a director's commentary (guided by video) you can now look at both the movie and in a smaller screen see the additional content (like picture-in-picture). Obviously this is Blu-ray 2.0 compatibility here, and the additional content is an actual feature of the movie. But definitely fun to see.
A new feature also is Dynamic Contrast Enhancement which was introduced by team green last year.
It does pretty much what the name says; Dynamic Contrast Enhancement technology will improve the contrast ratios in videos in real-time on the fly. It's a bit of a trivial thing to do, as there are certain situations where you do not want your contrast increased. Think for example a scary thriller, dark environment... and all of a sudden your trees light up. So with that in mind; the implementation has been done very delicately. It does work pretty well, but personally I'd rather tweak the contrast ratio myself and leave it at that. Another feature is Dynamic Color Enhancement. It's pretty much a color tone enhancement feature and will slightly enforce a color correction where it's needed. We'll show you that in a bit as I quite like this feature; it makes certain aspects of a movie a little more vivid.
Some, like others, hate these features. I say it's good to have choices and anything that can enhance image quality is nice to have in my book. Directly tied to the UVD engine is obviously also sound. AMD's Radeon series 3000 and now 4000 cards have a feature that the competition does not have. It can pass lossless sound directly through the HDMI connector. This has been upgraded as it's now possible to have 7.1 channel lossless sound, meaning DTS-ES and all other formats have now become a reality. A very nice move indeed as that distance between the living room and your PC is getting smaller each year. Yours truly for example has a nice Onkyo receiver which I connect HDMI to. This receiver will take those 7.1 channel sounds with a lot of interest, process them, and then pass through the HDMI content itself to the HD television. All that over just one HDMI cable.
With the Series 2000/3000/4000 graphics cards you'll receive a DVI-to-HDMI adapter which, and make no mistake here, will carry that sound over HDMI. That's unlike current DVI-HDMI adapters and cables which do not carry sound. Fantastic if you are watching a Blu-ray movie, simply connect HDMI to your HDTV for PCM sound, or connect it through a TrueHD/Dolby HD receiver and get that sound lovin' going on through that receiver of yours. All with one simple cable.
Again - mind you that to be able to playback high-def content you'll still need WinDVD or PowerDVD, a HD source (Blu-ray player) and a HDCP monitor or television.
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