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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 better sky diver factor score 88.99 vs 2.24 Around 39.8x better sky diver factor score
Higher effective memory clock speed 4,000 MHz vs 3,600 MHz More than 10% higher effective memory clock speed
Higher memory clock speed 1,000 MHz vs 900 MHz More than 10% higher memory clock speed
Significantly lower TDP 66W vs 150W 2.3x lower TDP
Front view of Radeon HD 4870

Reasons to consider the
ATi Radeon HD 4870

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Higher memory bandwidth 115.2 GB/s vs 64 GB/s 80% higher memory bandwidth
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
More texture mapping units 40 vs 24 16 more texture mapping units
Slightly more compute units 10 vs 6 4 more compute units

Benchmarks Real world tests of Radeon HD 6670 vs 4870

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

3DMark Vantage (Texture Fill) Industry standard benchmark that tests DirectX performance

T-Rex (GFXBench 3.0) Data courtesy CompuBench

Radeon HD 6670
3,356.86
Radeon HD 4870
3,353.62

Sky Diver Factor Data courtesy FutureMark

Cloud Gate Factor Data courtesy FutureMark

SmallLux GPU 2.0d4 Measures compute performance using OpenCL to do 3D rendering

Reviews Word on the street

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