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Differences What are the advantages of each

Front view of Radeon HD 6970M Rebrand

Reasons to consider the
AMD Radeon HD 6970M Rebrand

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Higher clock speed 800 MHz vs 550 MHz More than 45% higher clock speed
Higher effective memory clock speed 4,000 MHz vs 2,800 MHz Around 45% higher effective memory clock speed
Higher memory clock speed 1,000 MHz vs 700 MHz Around 45% higher memory clock speed
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 GB/s More than 2.8x higher memory bandwidth
Much wider memory bus 512 bit vs 128 bit 4x wider memory bus
More memory 2,048 MB vs 1,024 MB 2x more memory
More shading units 1,600 vs 800 Twice as many shading units
More texture mapping units 80 vs 40 Twice as many texture mapping units
More render output processors 32 vs 16 Twice as many render output processors
Slightly better floating-point performance 1,760 GFLOPS vs 1,280 GFLOPS Around 40% better floating-point performance
More compute units 20 vs 10 Twice as many compute units

Features Key features of the Radeon HD 6970M Rebrand  vs Mobility Radeon HD 4870 X2 

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

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

Radeon HD 6970M Rebrand  vs
Mobility Radeon HD 4870 X2 
GPU brand AMD ATI
GPU name Broadway M98
Market Laptop Laptop
Clock speed 800 MHz 550 MHz
Is dual GPU No Yes
Reference card None None

raw performance

Shading units 800 1,600
Texture mapping units 40 80
Render output processors 16 32
Compute units 10 20
Pixel rate 12.8 GPixel/s 17.6 GPixel/s
Texture rate 32 GTexel/s 44 GTexel/s
Floating-point performance 1,280 GFLOPS 1,760 GFLOPS

memory

Radeon HD 6970M Rebrand  vs
Mobility Radeon HD 4870 X2 
Memory clock speed 1,000 MHz 700 MHz
Effective memory clock speed 4,000 MHz 2,800 MHz
Memory bus 128 bit 512 bit
Memory 1,024 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 64 GB/s 179.2 GB/s

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