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According to AMD,the three graphics cards belong to entry-level DirectX 11 graphics cards,support single card multi-screen output,while the power consumption is lower and it’s suitable for low power consumption platform which doesn’t get much requirement towards 3D performance,like HTPC. Radeon HD 6450 is currently the most low-end graphics card in Radeon HD 6000 series,and it’s based on TSMC’s 40nm manufacturing process,low-profile design,packs 160 stream processors,4 ROPs,8 texture units with memory interface of 64-bit,512MB/1GB memory,GDDR5 or DDR3 memory,provides VGA,DVI and DisplayPort output connectors. Different with other products,the reference frequencies of Radeon HD 6450 are not revealed.According to the material provided by AMD,the core frequency of Radeon HD 6450 can be decided by manufacturers within range of 625MHz-750MHz.As for memory frequency,the range is 533MHz-800MHz(data rate of 1066MHz-1600MHz) for DDR3 memory while 800MHz-900MHz(data rate of 3200MHz-3600MHz) for GDDR5 memory.It has TDP of 18W for DDR3 while 27W for GDDR5. The position of Radeon HD 6570 is similar to that of Radeon HD 5550/5570,it’s based on TSMC’s 40nm manufacturing process,low-profile design,packs 480 stream processors,8 ROPs,24 texture units with memory interface of 128-bit,512MB/1GB memory,GDDR5 or DDR3 memory,provides VGA,DVI and DisplayPort output connectors. The reference core frequency of Radeon HD 6570 is 650MHz,the memory frequency and TDP vary according to different memory versions.The range is 900MHz-1000MHz(data rate of 3600MHz-4000MHz) for GDDR5 memory while 900MHz(data rate of 1800MHz) for DDR3 memory.It has TDP of 44W for DDR3 while 60W for GDDR5. The position of Radeon HD 6670 is close to that of last generation Radeon 5670,just from the specs it’s just the GDDR5 version of Radeon HD 6570,it’s based on TSMC’s 40nm manufacturing process,full-profile PCB design,packs 480 stream processors,8 ROPs,24 texture units with memory interface of 128-bit,512MB/1GB GDDR5 memory,provides VGA,DVI and DisplayPort output connectors. Radeon HD 6670 graphics card features higher reference frequencies with core/memory clock of 800MHz/1000MHz(data rate of 4000MHz),and it has TDP of 66W. It’s noteworthy that the three graphics cards have been earlier available to OEM market,but now the graphics card has officially entered into retail market.