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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 775 MHz Around 35% higher clock speed
Much better T-Rex score 3,360.38 vs 1,705.82 More than 95% better T-Rex score
Slightly better floating-point performance 790.3 GFLOPS vs 297.6 GFLOPS Around 2.8x 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 820A

Reasons to consider the
Nvidia GeForce 820A

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Lower TDP 15W vs 33W 2.2x lower TDP

Benchmarks Real world tests of GeForce 840A vs 820A

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 820A
1,705.82

Manhattan (GFXBench 3.0) Data courtesy CompuBench

GeForce 840A
3,613.42
GeForce 820A
1,716.7

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