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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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Slightly higher clock speed 825 MHz vs 750 MHz 10% higher clock speed
Higher memory bandwidth 76.8 GB/s vs 25.6 GB/s Around 3x higher memory bandwidth
Higher pixel rate 13.2 GPixel/s vs 3 GPixel/s Around 4.5x higher pixel rate
More render output processors 16 vs 4 12 more render output processors
Higher memory clock speed 1,200 MHz vs 800 MHz 50% higher memory clock speed
Wider memory bus 256 bit vs 64 bit 4x wider memory bus
Front view of Mobility Radeon HD 5470

Reasons to consider the
ATi Mobility Radeon HD 5470

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Higher effective memory clock speed 3,200 MHz vs 2,400 MHz Around 35% higher effective memory clock speed
Lower TDP 15W vs 106W 7.1x lower TDP

Features Key features of the Radeon HD 3870  vs Mobility Radeon HD 5470 

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

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


Radeon HD 3870  vs
Mobility Radeon HD 5470 
GPU name RV670 XT Park
Market Desktop Laptop
Clock speed 825 MHz 750 MHz
Is dual GPU No No
Reference card ATi Radeon HD 3870 777 MHz 512 MB None

raw performance

Shading units 320 80
Texture mapping units 16 8
Render output processors 16 4
Compute units 4 1
Pixel rate 13.2 GPixel/s 3 GPixel/s
Texture rate 13.2 GTexel/s 6 GTexel/s
Floating-point performance 528 GFLOPS 120 GFLOPS


Radeon HD 3870  vs
Mobility Radeon HD 5470 
Memory clock speed 1,200 MHz 800 MHz
Effective memory clock speed 2,400 MHz 3,200 MHz
Memory bus 256 bit 64 bit
Memory 512 MB 512 MB
Memory type GDDR4 GDDR5
Memory bandwidth 76.8 GB/s 25.6 GB/s

noise and power

TDP 106W 15W


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