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Differences What are the advantages of each

Front view of Radeon HD 3870

Reasons to consider the
Sapphire Radeon HD 3870

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Higher clock speed 825 MHz vs 660 MHz 25% higher clock speed
Higher effective memory clock speed 2,400 MHz vs 1,700 MHz More than 40% higher effective memory clock speed
Higher memory clock speed 1,200 MHz vs 850 MHz More than 40% higher memory clock speed
Front view of Mobility Radeon HD 3870 X2

Reasons to consider the
ATi Mobility Radeon HD 3870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Higher memory bandwidth 108.8 GB/s vs 76.8 GB/s More than 40% higher memory bandwidth
More render output processors 32 vs 16 Twice as many render output processors
Slightly higher pixel rate 21.12 GPixel/s vs 13.2 GPixel/s More than 60% higher pixel rate
More shading units 640 vs 320 Twice as many shading units
Wider memory bus 512 bit vs 256 bit 2x wider memory bus

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

Radeon HD 3870
13.2 GPixel/s

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

Radeon HD 3870
13.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 3870
528 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 3870  vs
Mobility Radeon HD 3870 X2 
GPU brand ATI ATI
GPU name RV670 XT M88
Market Desktop Laptop
Clock speed 825 MHz 660 MHz
Is dual GPU No Yes
Reference card ATi Radeon HD 3870 777 MHz 512 MB None

raw performance

Shading units 320 640
Texture mapping units 16 32
Render output processors 16 32
Compute units 4 8
Pixel rate 13.2 GPixel/s 21.12 GPixel/s
Texture rate 13.2 GTexel/s 21.12 GTexel/s
Floating-point performance 528 GFLOPS 844.8 GFLOPS

memory

Radeon HD 3870  vs
Mobility Radeon HD 3870 X2 
Memory clock speed 1,200 MHz 850 MHz
Effective memory clock speed 2,400 MHz 1,700 MHz
Memory bus 256 bit 512 bit
Memory 512 MB 1,024 MB
Memory type GDDR4 GDDR3
Memory bandwidth 76.8 GB/s 108.8 GB/s

noise and power

TDP 106W 110W

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