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Differences What are the advantages of each

Front view of Radeon HD 6670

Reasons to consider the
AMD Radeon HD 6670

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Higher clock speed 800 MHz vs 500 MHz 60% 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 4850 X2

Reasons to consider the
ATi Mobility Radeon HD 4850 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 64 GB/s More than 2.8x higher memory bandwidth
More render output processors 32 vs 8 24 more render output processors
More shading units 1,600 vs 480 1120 more shading units
Slightly more memory 2,048 MB vs 1,024 MB 2x more memory
More texture mapping units 80 vs 24 56 more texture mapping units
Slightly better floating-point performance 1,600 GFLOPS vs 768 GFLOPS More than 2x better floating-point performance
Higher pixel rate 16 GPixel/s vs 6.4 GPixel/s Around 2.5x higher pixel rate
More compute units 20 vs 6 14 more compute units
Wider memory bus 512 bit vs 128 bit 4x wider memory bus

Features Key features of the Radeon HD 6670  vs Mobility Radeon HD 4850 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

Radeon HD 6670
6.4 GPixel/s

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

Radeon HD 6670
19.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6670
768 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

Radeon HD 6670  vs
Mobility Radeon HD 4850 X2 
GPU brand AMD ATI
GPU name Turks XT M98
Market Desktop Laptop
Clock speed 800 MHz 500 MHz
Is dual GPU No Yes
Reference card None None

raw performance

Shading units 480 1,600
Texture mapping units 24 80
Render output processors 8 32
Compute units 6 20
Pixel rate 6.4 GPixel/s 16 GPixel/s
Texture rate 19.2 GTexel/s 40 GTexel/s
Floating-point performance 768 GFLOPS 1,600 GFLOPS

memory

Radeon HD 6670  vs
Mobility Radeon HD 4850 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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