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Differences What are the advantages of each

Front view of Mobility Radeon HD 4830

Reasons to consider the
ATi Mobility Radeon HD 4830

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Higher effective memory clock speed 2,800 MHz vs 1,802 MHz More than 55% higher effective memory clock speed
More shading units 640 vs 384 256 more shading units
Front view of GeForce GT 740M

Reasons to consider the
Nvidia GeForce GT 740M

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Significantly higher clock speed 810 MHz vs 550 MHz More than 45% higher clock speed
Better PassMark score 772 vs 514 More than 50% better PassMark score
More memory 2,048 MB vs 1,024 MB 2x more memory
Higher memory clock speed 901 MHz vs 700 MHz Around 30% higher memory clock speed

Benchmarks Real world tests of Mobility Radeon HD 4830 vs GeForce GT 740M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Mobility Radeon HD 4830  vs GeForce GT 740M 

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

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

GeForce GT 740M
6.48 GPixel/s

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

Mobility Radeon HD 4830
17.6 GTexel/s
GeForce GT 740M
25.92 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 740M
622.1 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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