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Differences What are the advantages of each

Front view of GeForce 9800M GT

Reasons to consider the
Nvidia GeForce 9800M GT

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Higher memory bandwidth 51.2 GB/s vs 28.83 GB/s Around 80% higher memory bandwidth
Significantly better T-Rex score 4,190.58 vs 3,353.8 Around 25% better T-Rex score
Significantly wider memory bus 256 bit vs 128 bit 2x wider memory bus
More texture mapping units 48 vs 32 16 more texture mapping units
Front view of GeForce 820M

Reasons to consider the
Nvidia GeForce 820M

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Significantly higher clock speed 810 MHz vs 500 MHz More than 60% higher clock speed
More memory 2,048 MB vs 512 MB 4x more memory
Slightly better floating-point performance 622.1 GFLOPS vs 240 GFLOPS More than 2.5x better floating-point performance
More shading units 384 vs 96 288 more shading units
Higher memory clock speed 901 MHz vs 800 MHz Around 15% higher memory clock speed
Lower TDP 45W vs 65W More than 30% lower TDP

Benchmarks Real world tests of GeForce 9800M GT vs 820M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce 9800M GT
4,190.58
GeForce 820M
3,353.8

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