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Differences What are the advantages of each

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 25.6 GB/s More than 2.8x higher memory bandwidth
Higher effective memory clock speed 2,252 MHz vs 1,600 MHz More than 40% higher effective memory clock speed
Slightly higher clock speed 777 MHz vs 700 MHz More than 10% higher clock speed
Higher pixel rate 12.43 GPixel/s vs 2.8 GPixel/s Around 4.5x higher pixel rate
More render output processors 16 vs 4 12 more render output processors
Higher memory clock speed 1,126 MHz vs 800 MHz More than 40% higher memory clock speed
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
Slightly more shading units 320 vs 120 200 more shading units
Front view of Radeon HD 2600 XT Mac

Reasons to consider the
ATi Radeon HD 2600 XT Mac

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Lower TDP 45W vs 106W 2.4x lower TDP

Features Key features of the Radeon HD 3870 Mac  vs 2600 XT Mac 

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 Mac
12.43 GPixel/s
Radeon HD 2600 XT Mac
2.8 GPixel/s

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

Radeon HD 3870 Mac
12.43 GTexel/s
Radeon HD 2600 XT Mac
5.6 GTexel/s

floating point performance How fast the gpu can crunch numbers

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 3870 Mac  vs
2600 XT Mac 
GPU brand ATI ATI
GPU name RV670 RV630
Market Desktop Desktop
Clock speed 777 MHz 700 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 320 120
Texture mapping units 16 8
Render output processors 16 4
Compute units 4 3
Pixel rate 12.43 GPixel/s 2.8 GPixel/s
Texture rate 12.43 GTexel/s 5.6 GTexel/s
Floating-point performance 497.3 GFLOPS 168 GFLOPS

memory

Radeon HD 3870 Mac  vs
2600 XT Mac 
Memory clock speed 1,126 MHz 800 MHz
Effective memory clock speed 2,252 MHz 1,600 MHz
Memory bus 256 bit 128 bit
Memory 512 MB 256 MB
Memory type GDDR4 GDDR3
Memory bandwidth 72.06 GB/s 25.6 GB/s

noise and power

TDP 106W 45W

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