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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
Significantly higher memory bandwidth 179.2 GB/s vs 64.1 GB/s More than 2.8x higher memory bandwidth
Much wider memory bus 512 bit vs 128 bit 4x wider memory bus
More shading units 1,600 vs 768 832 more shading units
Better floating-point performance 1,760 GFLOPS vs 1,224.2 GFLOPS Around 45% better floating-point performance
More render output processors 32 vs 16 Twice as many render output processors
More texture mapping units 80 vs 64 16 more texture mapping units
Front view of GeForce GTX 765M

Reasons to consider the
Nvidia GeForce GTX 765M

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Higher clock speed 797 MHz vs 550 MHz Around 45% higher clock speed
Higher effective memory clock speed 4,008 MHz vs 2,800 MHz Around 45% higher effective memory clock speed
Higher memory clock speed 1,002 MHz vs 700 MHz Around 45% higher memory clock speed

Features Key features of the Mobility Radeon HD 4870 X2  vs GeForce GTX 765M 

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 GTX 765M
12.75 GPixel/s

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

floating point performance How fast the gpu can crunch numbers

GeForce GTX 765M
1,224.2 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

gpu

Mobility Radeon HD 4870 X2  vs
GeForce GTX 765M 
GPU brand ATI Nvidia
GPU name M98 GK106
Market Laptop Laptop
Clock speed 550 MHz 797 MHz
Is dual GPU Yes No
Reference card None None

raw performance

Shading units 1,600 768
Texture mapping units 80 64
Render output processors 32 16
Pixel rate 17.6 GPixel/s 12.75 GPixel/s
Texture rate 44 GTexel/s 51 GTexel/s
Floating-point performance 1,760 GFLOPS 1,224.2 GFLOPS

memory

Mobility Radeon HD 4870 X2  vs
GeForce GTX 765M 
Memory clock speed 700 MHz 1,002 MHz
Effective memory clock speed 2,800 MHz 4,008 MHz
Memory bus 512 bit 128 bit
Memory 2,048 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 179.2 GB/s 64.1 GB/s

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