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Differences What are the advantages of each

Front view of Radeon HD 4870

Reasons to consider the
ATi Radeon HD 4870

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Significantly higher memory bandwidth 115.2 GB/s vs 25.6 GB/s Around 4.5x higher memory bandwidth
Significantly higher effective memory clock speed 3,600 MHz vs 1,600 MHz 2.2x higher effective memory clock speed
Higher clock speed 750 MHz vs 550 MHz More than 35% higher clock speed
Better floating-point performance 1,200 GFLOPS vs 89.6 GFLOPS Around 13.5x better floating-point performance
More shading units 800 vs 32 768 more shading units
Higher texture rate 30 GTexel/s vs 8.8 GTexel/s Around 3.5x higher texture rate
Slightly higher pixel rate 12 GPixel/s vs 4.4 GPixel/s Around 2.8x higher pixel rate
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
More texture mapping units 40 vs 16 24 more texture mapping units
More render output processors 16 vs 8 Twice as many render output processors
Higher memory clock speed 900 MHz vs 800 MHz Around 15% higher memory clock speed
Front view of GeForce GT 120 Mac

Reasons to consider the
Nvidia GeForce GT 120 Mac

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Significantly lower TDP 50W vs 150W 3x lower TDP

Features Key features of the Radeon HD 4870  vs GeForce GT 120 Mac 

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

Radeon HD 4870
115.2 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 4870
12 GPixel/s
GeForce GT 120 Mac
4.4 GPixel/s

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

Radeon HD 4870
30 GTexel/s
GeForce GT 120 Mac
8.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4870
1,200 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 4870  vs
GeForce GT 120 Mac 
GPU brand ATI Nvidia
GPU name RV770 G96 C1
Market Desktop Desktop
Clock speed 750 MHz 550 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 800 32
Texture mapping units 40 16
Render output processors 16 8
Pixel rate 12 GPixel/s 4.4 GPixel/s
Texture rate 30 GTexel/s 8.8 GTexel/s
Floating-point performance 1,200 GFLOPS 89.6 GFLOPS

memory

Radeon HD 4870  vs
GeForce GT 120 Mac 
Memory clock speed 900 MHz 800 MHz
Effective memory clock speed 3,600 MHz 1,600 MHz
Memory bus 256 bit 128 bit
Memory 512 MB 512 MB
Memory type GDDR5 GDDR3
Memory bandwidth 115.2 GB/s 25.6 GB/s

noise and power

TDP 150W 50W

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