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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 60.8 GB/s Around 3x higher memory bandwidth
Better floating-point performance 1,760 GFLOPS vs 374.5 GFLOPS Around 4.8x better floating-point performance
Many more shading units 1,600 vs 128 1472 more shading units
More memory 2,048 MB vs 1,024 MB 2x more memory
Much wider memory bus 512 bit vs 256 bit 2x wider memory bus
Higher effective memory clock speed 2,800 MHz vs 1,900 MHz More than 45% higher effective memory clock speed
More render output processors 32 vs 16 Twice as many render output processors
Higher pixel rate 17.6 GPixel/s vs 9.36 GPixel/s Around 90% higher pixel rate
More texture mapping units 80 vs 64 16 more texture mapping units
Front view of GeForce GTX 280M

Reasons to consider the
Nvidia GeForce GTX 280M

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Higher memory clock speed 950 MHz vs 700 MHz More than 35% higher memory clock speed

Features Key features of the Mobility Radeon HD 4870 X2  vs GeForce GTX 280M 

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 280M
9.36 GPixel/s

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

GeForce GTX 280M
37.44 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 280M
374.5 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

gpu

Mobility Radeon HD 4870 X2  vs
GeForce GTX 280M 
GPU brand ATI Nvidia
GPU name M98 G92
Market Laptop Laptop
Clock speed 550 MHz 585 MHz
Is dual GPU Yes No
Reference card None None

raw performance

Shading units 1,600 128
Texture mapping units 80 64
Render output processors 32 16
Pixel rate 17.6 GPixel/s 9.36 GPixel/s
Texture rate 44 GTexel/s 37.44 GTexel/s
Floating-point performance 1,760 GFLOPS 374.5 GFLOPS

memory

Mobility Radeon HD 4870 X2  vs
GeForce GTX 280M 
Memory clock speed 700 MHz 950 MHz
Effective memory clock speed 2,800 MHz 1,900 MHz
Memory bus 512 bit 256 bit
Memory 2,048 MB 1,024 MB
Memory type GDDR5 GDDR3
Memory bandwidth 179.2 GB/s 60.8 GB/s

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