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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 14.4 GB/s More than 3.5x higher memory bandwidth
Much wider memory bus 256 bit vs 64 bit 4x wider memory bus
Better T-Rex score 3,356.74 vs 3,352.98 Almost the same
More texture mapping units 48 vs 16 Three times as many texture mapping units
Slightly higher texture rate 24 GTexel/s vs 10 GTexel/s Around 2.5x higher texture rate
More render output processors 16 vs 8 Twice as many render output processors
Front view of GeForce 820M

Reasons to consider the
Nvidia GeForce 820M

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Higher clock speed 625 MHz vs 500 MHz 25% higher clock speed
Higher memory clock speed 900 MHz vs 800 MHz Around 15% higher memory clock speed
Lower TDP 15W vs 65W 4.3x 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
GeForce 820M

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