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Differences What are the advantages of each

Front view of Radeon HD 6490M

Reasons to consider the
AMD Radeon HD 6490M

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Higher effective memory clock speed 3,200 MHz vs 2,002 MHz Around 60% higher effective memory clock speed
Front view of GeForce 840M

Reasons to consider the
Nvidia GeForce 840M

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Higher clock speed 1,029 MHz vs 800 MHz Around 30% higher clock speed
Better 3DMark 11 graphics score 10,332 vs 5,571 More than 85% better 3DMark 11 graphics score
Better 3DMark vantage graphics score 6,627 vs 2,000.5 More than 3.2x better 3DMark vantage graphics score
Better 3DMark06 score 2,338 vs 601 Around 4x better 3DMark06 score
Better floating-point performance 790.3 GFLOPS vs 256 GFLOPS More than 3x better floating-point performance
Higher memory clock speed 1,001 MHz vs 800 MHz More than 25% higher memory clock speed
More shading units 384 vs 160 224 more shading units

Benchmarks Real world tests of Radeon HD 6490M vs GeForce 840M

3DMark 11 Graphics Industry standard benchmark that tests DirectX 11 GPU performance

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

Bitcoin mining Data courtesy CompuBench

Radeon HD 6490M
10.81 mHash/s
GeForce 840M
94.68 mHash/s

Face detection Data courtesy CompuBench

Radeon HD 6490M
2.55 mPixels/s
GeForce 840M
22.54 mPixels/s

Ocean surface simulation Data courtesy CompuBench

Radeon HD 6490M
96.4 frames/s
GeForce 840M
159.36 frames/s

Particle simulation Data courtesy CompuBench

Radeon HD 6490M
41.01 mInteraction/s
GeForce 840M
184.99 mInteraction/s

T-Rex (Compubench 1.5) Data courtesy CompuBench

Radeon HD 6490M
-1 frames/s
GeForce 840M
1.23 frames/s

Video composition Data courtesy CompuBench

Radeon HD 6490M
6 frames/s
GeForce 840M
21.01 frames/s

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