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Differences What are the advantages of each

Front view of Radeon HD 8570M GDDR5

Reasons to consider the
AMD Radeon HD 8570M GDDR5

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Higher effective memory clock speed 4,000 MHz vs 1,800 MHz Around 2.2x higher effective memory clock speed
Higher memory clock speed 1,000 MHz vs 900 MHz More than 10% higher memory clock speed
Front view of GeForce GT 640M

Reasons to consider the
Nvidia GeForce GT 640M

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Better 3DMark 11 graphics score 10,625.5 vs 5,650 Around 90% better 3DMark 11 graphics score
Better PassMark score 932 vs 548 More than 70% better PassMark score
Much better manhattan score 3,590.88 vs 1,528.31 More than 2.2x better manhattan score
Better 3DMark vantage graphics score 6,348 vs 3,750 Around 70% better 3DMark vantage graphics score
Significantly higher crysis 3 framerate 6.5 vs 2.3 More than 2.8x higher crysis 3 framerate
Significantly higher crysis 3 framerate 6.5 fps vs 2.3 fps More than 2.8x higher crysis 3 framerate
More render output processors 16 vs 8 Twice as many render output processors
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Higher BioShock infinite framerate 14.3 fps vs 4 fps More than 3.5x higher BioShock infinite framerate
Slightly more texture mapping units 32 vs 20 12 more texture mapping units

Benchmarks Real world tests of Radeon HD 8570M GDDR5 vs GeForce GT 640M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

T-Rex (GFXBench 3.0) Data courtesy CompuBench

Manhattan (GFXBench 3.0) Data courtesy CompuBench

Fire Strike Factor Data courtesy FutureMark

Sky Diver Factor Data courtesy FutureMark

Cloud Gate Factor Data courtesy FutureMark

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