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Differences What are the advantages of each

Front view of Radeon HD 6570

Reasons to consider the
Sapphire Radeon HD 6570

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Significantly more memory 4,096 MB vs 512 MB 8x more memory
Lower TDP 60W vs 106W Around 45% lower TDP
Front view of Radeon HD 3870 Mac

Reasons to consider the
ATi Radeon HD 3870 Mac

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Higher memory bandwidth 72.06 GB/s vs 21.34 GB/s Around 3.5x higher memory bandwidth
Higher clock speed 777 MHz vs 650 MHz Around 20% higher clock speed
Higher effective memory clock speed 2,252 MHz vs 1,334 MHz Around 70% higher effective memory clock speed
Significantly higher memory clock speed 1,126 MHz vs 667 MHz Around 70% higher memory clock speed
Slightly higher pixel rate 12.43 GPixel/s vs 5.2 GPixel/s Around 2.5x higher pixel rate
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
More render output processors 16 vs 8 Twice as many render output processors

Features Key features of the Radeon HD 6570  vs 3870 Mac 

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

Radeon HD 6570
21.34 GB/s
Radeon HD 3870 Mac
72.06 GB/s

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

Radeon HD 6570
5.2 GPixel/s
Radeon HD 3870 Mac
12.43 GPixel/s

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

Radeon HD 6570
15.6 GTexel/s
Radeon HD 3870 Mac
12.43 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6570
624 GFLOPS
Radeon HD 3870 Mac
497.3 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 6570  vs
3870 Mac 
GPU brand AMD ATI
GPU name Turks PRO RV670
Market Desktop Desktop
Clock speed 650 MHz 777 MHz
Is dual GPU No No
Reference card AMD Radeon HD 6570 650 MHz 2 GB None

raw performance

Shading units 480 320
Texture mapping units 24 16
Render output processors 8 16
Compute units 6 4
Pixel rate 5.2 GPixel/s 12.43 GPixel/s
Texture rate 15.6 GTexel/s 12.43 GTexel/s
Floating-point performance 624 GFLOPS 497.3 GFLOPS

memory

Radeon HD 6570  vs
3870 Mac 
Memory clock speed 667 MHz 1,126 MHz
Effective memory clock speed 1,334 MHz 2,252 MHz
Memory bus 128 bit 256 bit
Memory 4,096 MB 512 MB
Memory type DDR3 GDDR4
Memory bandwidth 21.34 GB/s 72.06 GB/s

noise and power

TDP 60W 106W

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