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Differences What are the advantages of each

Front view of Mobility Radeon HD 4850 X2

Reasons to consider the
ATi Mobility Radeon HD 4850 X2

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Higher memory bandwidth 179.2 GB/s vs 108.8 GB/s Around 65% higher memory bandwidth
More memory 2,048 MB vs 1,024 MB 2x more memory
Higher effective memory clock speed 2,800 MHz vs 1,700 MHz Around 65% higher effective memory clock speed
Significantly more shading units 1,600 vs 640 960 more shading units
Better floating-point performance 1,600 GFLOPS vs 844.8 GFLOPS Around 90% better floating-point performance
More texture mapping units 80 vs 32 48 more texture mapping units
More compute units 20 vs 8 12 more compute units
Higher texture rate 40 GTexel/s vs 21.12 GTexel/s Around 90% higher texture rate
Front view of Mobility Radeon HD 3870 X2

Reasons to consider the
ATi Mobility Radeon HD 3870 X2

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Higher clock speed 660 MHz vs 500 MHz More than 30% higher clock speed
Higher memory clock speed 850 MHz vs 700 MHz More than 20% higher memory clock speed

Features Key features of the Mobility Radeon HD 4850 X2  vs 3870 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

Mobility Radeon HD 4850 X2  vs
3870 X2 
GPU brand ATI ATI
GPU name M98 M88
Market Laptop Laptop
Clock speed 500 MHz 660 MHz
Is dual GPU Yes Yes
Reference card None None

raw performance

Shading units 1,600 640
Texture mapping units 80 32
Render output processors 32 32
Compute units 20 8
Pixel rate 16 GPixel/s 21.12 GPixel/s
Texture rate 40 GTexel/s 21.12 GTexel/s
Floating-point performance 1,600 GFLOPS 844.8 GFLOPS

memory

Mobility Radeon HD 4850 X2  vs
3870 X2 
Memory clock speed 700 MHz 850 MHz
Effective memory clock speed 2,800 MHz 1,700 MHz
Memory bus 512 bit 512 bit
Memory 2,048 MB 1,024 MB
Memory type GDDR5 GDDR3
Memory bandwidth 179.2 GB/s 108.8 GB/s

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