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The ATI Mobilty Radeon HD 4570 from AMD is a DirectX 10.1 lower-middle-class notebook graphics adapter. Technically it is a faster clocked Mobility Radeon 4530/4330.
AMD specifies a slow 64 Bit memory bus, but some GPU-Z variants state a 128 Bit bus (should be an error).
The gaming performance of the ATI Mobility Radeon HD4570 should be very similar to the desktop HD 4550 which features similar specifications. Benchmarks of the desktop card showed, that the most DirectX9 titles can be played fluently in high details and 1024x768 (like Call of Duty 4, F.E.A.R., UT3, World in Conflict). Demanding games like crysis only run in low-medium detail settings in decent frame rates.
The Mobility HD 4570 is based on the RV710 chip and features 80 stream processors (16 5-dimensional shader cores). These cores do the graphic work of the shader- and pixel pipelines of older GPUs. The stream processors are also called ALUs and are grouped in five-way VLIW units. Each of the five instructions of a VLIW bundle has to be independent from the others and therefore the performance depends on the optimization of the driver.
A speciality of the Radeon HD 4570 is the possibility to use ordinary DDR2 and DDR3 graphic memory (as a cheaper alternative to GDDR3). However, cards that use that kind of memory will be slower than others equipped with GDDR RAM.
The Mobility Radeon HD 4570 includes the Avivo HD called video technology including an onboard soundchip for 7.1 sound output over HDMI or DisplayPort and the 2nd generation UVD (Unified Video Decoder). This UVD 2 supports full bitstream decoding of H.264/MPEG-4 AVC and VC-1 streams. In addition to this, it also supports dual video stream decoding and Picture-in Picture mode which makes the UVD full BD-Live compliant. Simplified, the Avivo HD technology handles all video tasks and enables the GPU to decode HD videos.
AMD published a current consumtion of about 12-15 Watt for the HD 4570. Still it is unclear if this value represents the chip alone or the whole mxm board including the memory (which would include about 5 Watt).
Compared to the desktop ATI Radeon HD 4550, the mobile 4570 features a higher core clock (680 versus 600) and therefore performs a bit better than the desktop 4650 (if the notebook manufacturer uses GDDR3 memory).