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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 clock speed 777 MHz vs 550 MHz More than 40% higher clock speed
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
Higher pixel rate 12.43 GPixel/s vs 4.4 GPixel/s More than 2.8x higher pixel rate
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
More render output processors 16 vs 8 Twice as many render output processors
More shading units 320 vs 32 288 more shading units
Front view of GeForce GT 120 Mac

Reasons to consider the
Nvidia GeForce GT 120 Mac

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Lower TDP 50W vs 106W 2.1x lower TDP

Features Key features of the Radeon HD 3870 Mac  vs GeForce GT 120 Mac 

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

Radeon HD 3870 Mac
72.06 GB/s
GeForce GT 120 Mac
25.6 GB/s

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

Radeon HD 3870 Mac
12.43 GPixel/s
GeForce GT 120 Mac
4.4 GPixel/s

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

Radeon HD 3870 Mac
12.43 GTexel/s
GeForce GT 120 Mac
8.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 3870 Mac
497.3 GFLOPS
GeForce GT 120 Mac
89.6 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
GeForce GT 120 Mac 
GPU brand ATI Nvidia
GPU name RV670 G96 C1
Market Desktop Desktop
Clock speed 777 MHz 550 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 320 32
Texture mapping units 16 16
Render output processors 16 8
Pixel rate 12.43 GPixel/s 4.4 GPixel/s
Texture rate 12.43 GTexel/s 8.8 GTexel/s
Floating-point performance 497.3 GFLOPS 89.6 GFLOPS

memory

Radeon HD 3870 Mac  vs
GeForce GT 120 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 512 MB
Memory type GDDR4 GDDR3
Memory bandwidth 72.06 GB/s 25.6 GB/s

noise and power

TDP 106W 50W

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