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Differences What are the advantages of each

Front view of Mobility Radeon HD 4870 X2

Reasons to consider the
ATi Mobility Radeon HD 4870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Much higher memory bandwidth 179.2 GB/s vs 12.8 GB/s Around 14x higher memory bandwidth
Much wider memory bus 512 bit vs 64 bit 8x wider memory bus
Better floating-point performance 1,760 GFLOPS vs 240 GFLOPS More than 7.2x better floating-point performance
Many more shading units 1,600 vs 96 1504 more shading units
Higher effective memory clock speed 2,800 MHz vs 1,600 MHz 75% higher effective memory clock speed
Significantly more texture mapping units 80 vs 16 64 more texture mapping units
Significantly more render output processors 32 vs 8 24 more render output processors
Higher pixel rate 17.6 GPixel/s vs 2.5 GPixel/s More than 7x higher pixel rate
Higher texture rate 44 GTexel/s vs 10 GTexel/s Around 4.5x higher texture rate
Front view of GeForce GT 720M

Reasons to consider the
Nvidia GeForce GT 720M

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Higher clock speed 625 MHz vs 550 MHz Around 15% higher clock speed
Higher memory clock speed 800 MHz vs 700 MHz Around 15% higher memory clock speed

Features Key features of the Mobility Radeon HD 4870 X2  vs GeForce GT 720M 

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 720M
2.5 GPixel/s

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

floating point performance How fast the gpu can crunch numbers

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

Specifications Full list of technical specs

gpu

Mobility Radeon HD 4870 X2  vs
GeForce GT 720M 
GPU brand ATI Nvidia
GPU name M98 GF117
Market Laptop Laptop
Clock speed 550 MHz 625 MHz
Is dual GPU Yes No
Reference card None None

raw performance

Shading units 1,600 96
Texture mapping units 80 16
Render output processors 32 8
Pixel rate 17.6 GPixel/s 2.5 GPixel/s
Texture rate 44 GTexel/s 10 GTexel/s
Floating-point performance 1,760 GFLOPS 240 GFLOPS

memory

Mobility Radeon HD 4870 X2  vs
GeForce GT 720M 
Memory clock speed 700 MHz 800 MHz
Effective memory clock speed 2,800 MHz 1,600 MHz
Memory bus 512 bit 64 bit
Memory 2,048 MB 2,048 MB
Memory type GDDR5 DDR3
Memory bandwidth 179.2 GB/s 12.8 GB/s

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