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Differences What are the advantages of each

Front view of Radeon HD 5770 Mac

Reasons to consider the
ATi Radeon HD 5770 Mac

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Significantly lower TDP 108W vs 195W Around 45% lower TDP
Front view of GeForce GTX 680 Mac

Reasons to consider the
EVGA GeForce GTX 680 Mac

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Much higher memory bandwidth 192.3 GB/s vs 76.48 GB/s More than 2.5x higher memory bandwidth
Significantly higher texture rate 128.8 GTexel/s vs 34 GTexel/s More than 3.8x higher texture rate
Higher clock speed 1,006 MHz vs 850 MHz Around 20% higher clock speed
Higher effective memory clock speed 6,008 MHz vs 4,780 MHz More than 25% higher effective memory clock speed
Better floating-point performance 3,090.4 GFLOPS vs 1,360 GFLOPS More than 2.2x better floating-point performance
Significantly more texture mapping units 128 vs 40 88 more texture mapping units
More memory 2,048 MB vs 1,024 MB 2x more memory
Higher pixel rate 32.2 GPixel/s vs 13.6 GPixel/s More than 2.2x higher pixel rate
More shading units 1,536 vs 800 736 more shading units
More render output processors 32 vs 16 Twice as many render output processors
Higher memory clock speed 1,502 MHz vs 1,195 MHz More than 25% higher memory clock speed
Wider memory bus 256 bit vs 128 bit 2x wider memory bus

Features Key features of the Radeon HD 5770 Mac  vs GeForce GTX 680 Mac 

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

Radeon HD 5770 Mac
76.48 GB/s
GeForce GTX 680 Mac
192.3 GB/s

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

Radeon HD 5770 Mac
13.6 GPixel/s
GeForce GTX 680 Mac
32.2 GPixel/s

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

Radeon HD 5770 Mac
34 GTexel/s
GeForce GTX 680 Mac
128.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 5770 Mac
1,360 GFLOPS
GeForce GTX 680 Mac
3,090.4 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 5770 Mac  vs
GeForce GTX 680 Mac 
GPU brand ATI Nvidia
GPU name Juniper GK104
Market Desktop Desktop
Clock speed 850 MHz 1,006 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GTX 680 Mac Edition 1 GHz 2 GB

raw performance

Shading units 800 1,536
Texture mapping units 40 128
Render output processors 16 32
Pixel rate 13.6 GPixel/s 32.2 GPixel/s
Texture rate 34 GTexel/s 128.8 GTexel/s
Floating-point performance 1,360 GFLOPS 3,090.4 GFLOPS

memory

Radeon HD 5770 Mac  vs
GeForce GTX 680 Mac 
Memory clock speed 1,195 MHz 1,502 MHz
Effective memory clock speed 4,780 MHz 6,008 MHz
Memory bus 128 bit 256 bit
Memory 1,024 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 76.48 GB/s 192.3 GB/s

noise and power

TDP 108W 195W

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