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Differences What are the advantages of each

Front view of Radeon HD 6770M

Reasons to consider the
AMD Radeon HD 6770M

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Higher clock speed 725 MHz vs 500 MHz 45% higher clock speed
Higher effective memory clock speed 3,600 MHz vs 1,584 MHz More than 2.2x higher effective memory clock speed
Higher memory bandwidth 57.6 GB/s vs 25.34 GB/s More than 2.2x higher memory bandwidth
More memory 1,024 MB vs 256 MB 4x more memory
Better floating-point performance 696 GFLOPS vs 80 GFLOPS Around 8.8x better floating-point performance
More shading units 480 vs 32 448 more shading units
Higher memory clock speed 900 MHz vs 792 MHz Around 15% higher memory clock speed
Front view of GeForce GT 120M Mac

Reasons to consider the
Nvidia GeForce GT 120M Mac

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Lower TDP 14W vs 35W 2.5x lower TDP

Features Key features of the Radeon HD 6770M  vs GeForce GT 120M Mac 

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

Radeon HD 6770M
57.6 GB/s
GeForce GT 120M Mac
25.34 GB/s

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

Radeon HD 6770M
5.8 GPixel/s
GeForce GT 120M Mac
4 GPixel/s

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

Radeon HD 6770M
17.4 GTexel/s
GeForce GT 120M Mac
8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6770M
696 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 6770M  vs
GeForce GT 120M Mac 
GPU brand AMD Nvidia
GPU name Whistler G96C
Market Laptop Laptop
Clock speed 725 MHz 500 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 480 32
Texture mapping units 24 16
Render output processors 8 8
Pixel rate 5.8 GPixel/s 4 GPixel/s
Texture rate 17.4 GTexel/s 8 GTexel/s
Floating-point performance 696 GFLOPS 80 GFLOPS

memory

Radeon HD 6770M  vs
GeForce GT 120M Mac 
Memory clock speed 900 MHz 792 MHz
Effective memory clock speed 3,600 MHz 1,584 MHz
Memory bus 128 bit 128 bit
Memory 1,024 MB 256 MB
Memory type GDDR5 GDDR3
Memory bandwidth 57.6 GB/s 25.34 GB/s

noise and power

TDP 35W 14W

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