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Differences What are the advantages of each

Front view of Radeon R7 240

Reasons to consider the
AMD Radeon R7 240

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More memory 2,048 MB vs 512 MB 4x more memory
Lower TDP 30W vs 106W 3.5x 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 28.8 GB/s More than 2.5x higher memory bandwidth
Higher effective memory clock speed 2,252 MHz vs 1,800 MHz More than 25% higher effective memory clock speed
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
Higher memory clock speed 1,126 MHz vs 900 MHz More than 25% higher memory clock speed

Features Key features of the Radeon R7 240  vs HD 3870 Mac 

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

Radeon R7 240
28.8 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 R7 240
6.24 GPixel/s
Radeon HD 3870 Mac
12.43 GPixel/s

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

Radeon R7 240
15.6 GTexel/s
Radeon HD 3870 Mac
12.43 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R7 240
499.2 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 R7 240  vs
HD 3870 Mac 
GPU brand AMD ATI
GPU name Oland RV670
Market Desktop Desktop
Clock speed 730 MHz 777 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 320 320
Texture mapping units 20 16
Render output processors 8 16
Compute units 5 4
Pixel rate 6.24 GPixel/s 12.43 GPixel/s
Texture rate 15.6 GTexel/s 12.43 GTexel/s
Floating-point performance 499.2 GFLOPS 497.3 GFLOPS

memory

Radeon R7 240  vs
HD 3870 Mac 
Memory clock speed 900 MHz 1,126 MHz
Effective memory clock speed 1,800 MHz 2,252 MHz
Memory bus 128 bit 256 bit
Memory 2,048 MB 512 MB
Memory type DDR3 GDDR4
Memory bandwidth 28.8 GB/s 72.06 GB/s

noise and power

TDP 30W 106W

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