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Differences What are the advantages of each

Front view of Radeon HD 7950 Mac

Reasons to consider the
AMD Radeon HD 7950 Mac

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Much higher memory bandwidth 240 GB/s vs 25.6 GB/s Around 9.5x higher memory bandwidth
Significantly higher effective memory clock speed 5,000 MHz vs 1,600 MHz Around 3.2x higher effective memory clock speed
Higher clock speed 800 MHz vs 550 MHz More than 45% higher clock speed
More memory 3,072 MB vs 512 MB 6x more memory
Better floating-point performance 2,867.2 GFLOPS vs 89.6 GFLOPS 32x better floating-point performance
Many more shading units 1,792 vs 32 1760 more shading units
Higher texture rate 89.6 GTexel/s vs 22.4 GTexel/s Around 4x higher texture rate
Significantly more texture mapping units 112 vs 16 96 more texture mapping units
More render output processors 32 vs 8 24 more render output processors
Higher pixel rate 25.6 GPixel/s vs 11.2 GPixel/s More than 2.2x higher pixel rate
Higher memory clock speed 1,250 MHz vs 800 MHz More than 55% higher memory clock speed
Wider memory bus 384 bit vs 128 bit 3x wider memory bus
Front view of GeForce GT 120 Mac

Reasons to consider the
Nvidia GeForce GT 120 Mac

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Much lower TDP 50W vs 200W 4x lower TDP

Features Key features of the Radeon HD 7950 Mac  vs GeForce GT 120 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 7950 Mac
25.6 GPixel/s
GeForce GT 120 Mac
11.2 GPixel/s

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

Radeon HD 7950 Mac
89.6 GTexel/s
GeForce GT 120 Mac
22.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7950 Mac
2,867.2 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 7950 Mac  vs
GeForce GT 120 Mac 
GPU brand AMD Nvidia
GPU name Tahiti PRO G96 C1
Market Desktop Desktop
Clock speed 800 MHz 550 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 1,792 32
Texture mapping units 112 16
Render output processors 32 8
Pixel rate 25.6 GPixel/s 11.2 GPixel/s
Texture rate 89.6 GTexel/s 22.4 GTexel/s
Floating-point performance 2,867.2 GFLOPS 89.6 GFLOPS

memory

Radeon HD 7950 Mac  vs
GeForce GT 120 Mac 
Memory clock speed 1,250 MHz 800 MHz
Effective memory clock speed 5,000 MHz 1,600 MHz
Memory bus 384 bit 128 bit
Memory 3,072 MB 512 MB
Memory type GDDR5 GDDR3
Memory bandwidth 240 GB/s 25.6 GB/s

noise and power

TDP 200W 50W

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