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Differences What are the advantages of each

Front view of GeForce GT 720M

Reasons to consider the
Nvidia GeForce GT 720M

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Higher clock speed 625 MHz vs 500 MHz 25% higher clock speed
More memory 2,048 MB vs 512 MB 4x more memory
Lower TDP 33W vs 65W Around 50% lower TDP
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 10 GTexel/s 6x higher texture rate
Higher memory bandwidth 51.2 GB/s vs 12.8 GB/s More than 4x higher memory bandwidth
Higher pixel rate 20 GPixel/s vs 2.5 GPixel/s 8x higher pixel rate
Much wider memory bus 256 bit vs 64 bit 4x wider memory bus
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

Benchmarks Real world tests of GeForce GT 720M vs 9800M GT

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce GT 720M  vs 9800M GT 

memory bandwidth Rate at which data can be read from or stored in onboard memory

GeForce GT 720M
12.8 GB/s
GeForce 9800M GT
51.2 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

GeForce GT 720M
2.5 GPixel/s
GeForce 9800M GT
20 GPixel/s

texture rate Speed at which a graphics card can perform texture mapping

GeForce GT 720M
10 GTexel/s
GeForce 9800M GT
60 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 720M
240 GFLOPS
GeForce 9800M GT
240 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

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