ATI is a new graphics technology- ATI Mobility Radeon HD 4870×2 enhances the graphics experience but not commensurate to the power it consumes, and to some extent the graphics quality is determined by the type of gaming support and drivers used with the Radeon HD 4870x 2 which combines two RV770 chips on a single board and empowers the graphics performance by dynamic Crossfire technology to create greater user experience in 3D games.
For all games that require high resolution graphics and speedy frame rate with larger memory interface, ATI Radeon HD 4870 X2 is the best choice. High end games like DirectX 9 and even DirectX 10 games become graphic-rich with 2.4 teraFLOPS graphics horse power of ATI Mobility Radeon HD 4870×2. But a dilemma is the incompatibility of GDDR3 graphics memory RAMs, which support all laptops, with the high speed HD 4870x 2 that requires GDDR5 graphics RAM.
Another problem with HD4870x 2 is the slight stutter that it experiences at 30 fps because of the discreet display pattern of frames that causes a gap between the display of the frame pairs. ATI has combined two RV770 chips with 1600 stream processors along with 2 GB of GDDR5 memory to create a powerful graphics card. The shader cores are similar to the role of pixel pipelines in previous Graphics processing units. The processors used in Mobility HD 4870 x2 are known as ALUs that require optimum functionality of the driver used with this graphics card because of the unique instructions of the five-way VLIW units in ALUs.
Video technology- Avivo HD is used in this graphics card that has a soundchip producing 7.1 sound output with a second generation video decoder. Unified Video Decoder enables decoding of H.264/MPEG-4 AVC and VC-1 streams. Moreover HD 4870x 2 can decode two video streams and complies with the unified video decoder BD-live with its picture-in-picture mode that supports all display resolutions up to 1920×10802. Avivo HD helps the graphics processing unit to handle high definition videos.
ATI (now known as AMD) established the power input requirement of HD 4870 X2 of 2×65 watt but whether this power is solely consumed by the chip or denotes the input of mxm board along with the memory, is a vague notion.
The 4870 X2 graphics technology designed for mobiles has a comparatively slower core clock than the desktop ATI Radeon HD 4870 X2 and performs slower. The RV770 GPU includes a CrossFire X Sideport that, AMD claims, will tackle the problem of scaling from one GPU to two and will provide efficient response.