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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 texture rate 60 GTexel/s vs 16.46 GTexel/s Around 3.8x higher texture rate
Higher memory bandwidth 51.2 GB/s vs 16.02 GB/s Around 3.2x higher memory bandwidth
Much wider memory bus 256 bit vs 64 bit 4x wider memory bus
Higher pixel rate 20 GPixel/s vs 8.23 GPixel/s Around 2.5x higher pixel rate
More texture mapping units 48 vs 16 Three times as many texture mapping units
More render output processors 16 vs 8 Twice as many render output processors
Front view of GeForce 840M

Reasons to consider the
Nvidia GeForce 840M

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Much higher clock speed 1,029 MHz vs 500 MHz More than 2x higher clock speed
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 800 MHz More than 25% higher memory clock speed
Lower TDP 33W vs 65W Around 50% lower TDP

Benchmarks Real world tests of GeForce 9800M GT vs 840M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce 840M
3,359.61

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