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Differences What are the advantages of each

Front view of GeForce 840A

Reasons to consider the
Nvidia GeForce 840A

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Significantly higher clock speed 1,029 MHz vs 625 MHz Around 65% higher clock speed
Better PassMark score 873 vs 600 More than 45% better PassMark score
Much better T-Rex score 3,360.38 vs 2,209.86 More than 50% better T-Rex score
Better floating-point performance 790.3 GFLOPS vs 240 GFLOPS More than 3.2x better floating-point performance
More shading units 384 vs 96 288 more shading units
Higher memory clock speed 1,001 MHz vs 900 MHz More than 10% higher memory clock speed
Front view of GeForce 820M

Reasons to consider the
Nvidia GeForce 820M

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Lower TDP 15W vs 33W 2.2x lower TDP

Benchmarks Real world tests of GeForce 840A vs 820M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce 840A
3,360.38
GeForce 820M
2,209.86

Manhattan (GFXBench 3.0) Data courtesy CompuBench

GeForce 840A
3,613.42
GeForce 820M
2,117.11

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