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Differences What are the advantages of each

Front view of Radeon HD 6670

Reasons to consider the
AMD Radeon HD 6670

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Significantly higher clock speed 800 MHz vs 625 MHz Around 30% higher clock speed
Significantly higher effective memory clock speed 4,000 MHz vs 1,986 MHz More than 2x higher effective memory clock speed
Slightly more memory 1,024 MB vs 512 MB 2x more memory
Lower TDP 66W vs 110W 40% lower TDP
Front view of Radeon HD 4850

Reasons to consider the
ATi Radeon HD 4850

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Better 3DMark06 score 14,160 vs 9,160 Around 55% better 3DMark06 score
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
More render output processors 16 vs 8 Twice as many render output processors
More shading units 800 vs 480 320 more shading units

Benchmarks Real world tests of Radeon HD 6670 vs 4850

Passmark Industry standard benchmark for overall graphics card performance

3DMark Vantage Graphics Industry standard benchmark that tests DirectX 10 GPU performance

3DMark06 Industry standard benchmark that tests DirectX 9 GPU performance

Reviews Word on the street

Radeon HD 6670  vs 4850 

Low PowerMedium PowerHigh PowerCore Clock500 MHz500 MHz625 MHzMemory Clock750 MHz750 MHz900 MHzGPU Voltage1.046 V1.046 V1.082 V The load detection is not dependent on 3D fullscreen, but on actual GPU usage.
Radeon HD 4850

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