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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
Higher memory bandwidth 179.2 GB/s vs 96.2 GB/s More than 85% higher memory bandwidth
Much wider memory bus 512 bit vs 192 bit Around 2.8x wider memory bus
More shading units 1,600 vs 960 640 more shading units
More render output processors 32 vs 24 8 more render output processors
Front view of GeForce GTX 770M

Reasons to consider the
Nvidia GeForce GTX 770M

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Higher clock speed 706 MHz vs 550 MHz Around 30% higher clock speed
More memory 3,072 MB vs 2,048 MB 50% more memory
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 770M 

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 770M
14.12 GPixel/s

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

GeForce GTX 770M
56.5 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 770M
1,355.5 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 GTX 770M 
GPU brand ATI Nvidia
GPU name M98 GK106
Market Laptop Laptop
Clock speed 550 MHz 706 MHz
Is dual GPU Yes No
Reference card None None

raw performance

Shading units 1,600 960
Texture mapping units 80 80
Render output processors 32 24
Pixel rate 17.6 GPixel/s 14.12 GPixel/s
Texture rate 44 GTexel/s 56.5 GTexel/s
Floating-point performance 1,760 GFLOPS 1,355.5 GFLOPS


Mobility Radeon HD 4870 X2  vs
GeForce GTX 770M 
Memory clock speed 700 MHz 1,002 MHz
Effective memory clock speed 2,800 MHz 4,008 MHz
Memory bus 512 bit 192 bit
Memory 2,048 MB 3,072 MB
Memory type GDDR5 GDDR5
Memory bandwidth 179.2 GB/s 96.2 GB/s

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