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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 14.4 GB/s Around 12.5x higher memory bandwidth
Much wider memory bus 512 bit vs 64 bit 8x wider memory bus
Significantly more shading units 1,600 vs 384 1216 more shading units
Better floating-point performance 1,760 GFLOPS vs 823.3 GFLOPS Around 2.2x better floating-point performance
Higher effective memory clock speed 2,800 MHz vs 1,800 MHz More than 55% higher effective memory clock speed
Significantly more render output processors 32 vs 8 24 more render output processors
Significantly more texture mapping units 80 vs 24 56 more texture mapping units
Higher pixel rate 17.6 GPixel/s vs 8.58 GPixel/s More than 2x higher pixel rate
Higher texture rate 44 GTexel/s vs 25.73 GTexel/s More than 70% higher texture rate
Front view of GeForce 940M

Reasons to consider the
Nvidia GeForce 940M

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Much higher clock speed 1,072 MHz vs 550 MHz Around 95% higher clock speed
Higher memory clock speed 900 MHz vs 700 MHz Around 30% higher memory clock speed

Features Key features of the Mobility Radeon HD 4870 X2  vs GeForce 940M 

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 940M
8.58 GPixel/s

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

GeForce 940M
25.73 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce 940M
823.3 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

Specifications Full list of technical specs


Mobility Radeon HD 4870 X2  vs
GeForce 940M 
GPU brand ATI Nvidia
GPU name M98 GM108
Market Laptop Laptop
Clock speed 550 MHz 1,072 MHz
Is dual GPU Yes No
Reference card None Nvidia GeForce 940M 1 GHz 2 GB

raw performance

Shading units 1,600 384
Texture mapping units 80 24
Render output processors 32 8
Pixel rate 17.6 GPixel/s 8.58 GPixel/s
Texture rate 44 GTexel/s 25.73 GTexel/s
Floating-point performance 1,760 GFLOPS 823.3 GFLOPS


Mobility Radeon HD 4870 X2  vs
GeForce 940M 
Memory clock speed 700 MHz 900 MHz
Effective memory clock speed 2,800 MHz 1,800 MHz
Memory bus 512 bit 64 bit
Memory 2,048 MB 2,048 MB
Memory type GDDR5 DDR3
Memory bandwidth 179.2 GB/s 14.4 GB/s

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