Palit Radeon HD4870 512MB Graphics Card Review

Enhancing the Visual Experience

ATI’s cards have been the staple of people building HTPCs for some time now with features like UVD, HDMI and high-end audio options. With the HD4800-series, AMD are taking things to the next level with some very interesting advances on their already-established technologies which will make these cards even more appealing to HTPC aficionados and regular consumers alike.

To do this they have set before themselves three primary goals: to provide multi-stream HD playback as supported in Blu-Ray 2.0 profiled movies, to improve the visual quality on HD monitors and to accomplish fast video transcoding by taking advantage of the processing power of the R770 core. Considering we have seen in the past how well features like UVD work, any enhancements to already-existing features is more than welcome in today’s quickly changing world of high definition. While we will be going over some of the features ATI has implemented it is just the tip of the iceberg of what is being offered to those of us who use our graphics cards to process HD signals.


UVD 2 – Dual Bitstream Playback


With Blu-Ray finally winning the high definition format wars, manufacturers have taken lightning-quick steps to step up support for the format. One of the many ways AMD is doing this is through full support of the Blu-Ray 1.1 profile and BD Live (profile 2.0). With UVD 2 the R770 processors are able to decode two streams of high definition (H.264, VC-1 and MPEG-2) content in order to give the viewer the picture-in-picture options present in the 1.1 profile. This gives us the capability to watch a movie in large format while having something like an alternate scene or director’s commentary playing in the smaller picture in the corner of the screen.


High Definition Audio & Video through HDMI


HDMI is quickly becoming the standard of choice for high definition movie and audio aficionados. With the HD3800 series AMD supported 5.1 channel audio-out through the HDMI connector but with the HD4800-series, they have taken things one step further by offering full 7.1 channel output. This means the these new cards will have support for AC3, DTS, Dolby True-HD and DTS HD formats with a full 6.144 Mbps bit rate and 192KHz sample rate along with up to 24 bits/sample. Add to this native HDCP support and true 1080P output and what we have here is a true multimedia powerhouse.

Did we mention that the R770 core has native support for Display Port as well? Well, it does but it is up to the board partner’s discretion whether they add the necessary output connector.


Video Transcoding


In their presentations, AMD has stressed the importance of the amount of processing power their stream processors bring to the table in various applications including video transcoding. Through CyberLink’s upcoming Power Director 7, users will be able to simultaneously transcode multiple 1080P videos up to 19 times faster than they would if they were using a dual core processor. Coupled with the low power consumption of the HD4800-series processors, the possibility of using this feature in numerous video encoding and decoding applications is virtually boundless.