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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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Higher effective memory clock speed 4,000 MHz vs 1,802 MHz Around 2.2x higher effective memory clock speed
Significantly lower TDP 66W vs 165W 2.5x lower TDP
Front view of Radeon HD 3870 X2

Reasons to consider the
ATi Radeon HD 3870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Higher memory bandwidth 115.32 GB/s vs 64 GB/s More than 80% higher memory bandwidth
Higher pixel rate 26.4 GPixel/s vs 6.4 GPixel/s Around 4.2x higher pixel rate
More render output processors 32 vs 8 24 more render output processors
Wider memory bus 512 bit vs 128 bit 4x wider memory bus

Benchmarks Real world tests of Radeon HD 6670 vs 3870 X2

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

T-Rex (GFXBench 3.0) Data courtesy CompuBench

Radeon HD 6670
3,357.74

Cloud Gate Factor Data courtesy FutureMark

Reviews Word on the street

Radeon HD 6670  vs 3870 X2 

8.3
8.4
This metal case packaging was introduced by Sapphire with the HD 3870 Atomic Edition (non-X2).
Radeon HD 3870 X2

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