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Differences What are the advantages of each

Front view of Radeon HD 8570A

Reasons to consider the
AMD Radeon HD 8570A

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Slightly more memory 1,024 MB vs 512 MB 2x more memory
Front view of Radeon HD 3870

Reasons to consider the
Sapphire Radeon HD 3870

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Higher memory bandwidth 76.8 GB/s vs 16 GB/s More than 4.8x higher memory bandwidth
Slightly higher clock speed 825 MHz vs 750 MHz 10% higher clock speed
More render output processors 16 vs 8 Twice as many render output processors
Higher memory clock speed 1,200 MHz vs 1,000 MHz 20% higher memory clock speed
Wider memory bus 256 bit vs 64 bit 4x wider memory bus

Features Key features of the Radeon HD 8570A  vs 3870 

memory bandwidth Rate at which data can be read from or stored in onboard memory

Radeon HD 8570A
16 GB/s
Radeon HD 3870
76.8 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

Radeon HD 8570A
6.6 GPixel/s
Radeon HD 3870
13.2 GPixel/s

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

Radeon HD 8570A
16.5 GTexel/s
Radeon HD 3870
13.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 8570A
528 GFLOPS
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 8570A  vs
3870 
GPU brand AMD ATI
GPU name Sun RV670 XT
Market Laptop Desktop
Clock speed 750 MHz 825 MHz
Is dual GPU No No
Reference card None ATi Radeon HD 3870 777 MHz 512 MB

raw performance

Shading units 320 320
Texture mapping units 20 16
Render output processors 8 16
Compute units 5 4
Pixel rate 6.6 GPixel/s 13.2 GPixel/s
Texture rate 16.5 GTexel/s 13.2 GTexel/s
Floating-point performance 528 GFLOPS 528 GFLOPS

memory

Radeon HD 8570A  vs
3870 
Memory clock speed 1,000 MHz 1,200 MHz
Effective memory clock speed 2,000 MHz 2,400 MHz
Memory bus 64 bit 256 bit
Memory 1,024 MB 512 MB
Memory type DDR3 GDDR4
Memory bandwidth 16 GB/s 76.8 GB/s

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