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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 76.48 GB/s Around 3.2x higher memory bandwidth
More memory 3,072 MB vs 1,024 MB 3x more memory
Better floating-point performance 2,867.2 GFLOPS vs 1,360 GFLOPS More than 2x better floating-point performance
Higher texture rate 89.6 GTexel/s vs 34 GTexel/s Around 2.8x higher texture rate
Significantly more texture mapping units 112 vs 40 72 more texture mapping units
Significantly more shading units 1,792 vs 800 992 more shading units
Much wider memory bus 384 bit vs 128 bit 3x wider memory bus
Significantly more compute units 28 vs 10 18 more compute units
More render output processors 32 vs 16 Twice as many render output processors
Higher pixel rate 25.6 GPixel/s vs 13.6 GPixel/s Around 90% higher pixel rate
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 200W More than 45% lower TDP

Features Key features of the Radeon HD 7950 Mac  vs 5770 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
Radeon HD 5770 Mac
13.6 GPixel/s

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

Radeon HD 7950 Mac
89.6 GTexel/s
Radeon HD 5770 Mac
34 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7950 Mac
2,867.2 GFLOPS
Radeon HD 5770 Mac
1,360 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


Radeon HD 7950 Mac  vs
5770 Mac 
GPU name Tahiti PRO Juniper
Market Desktop Desktop
Clock speed 800 MHz 850 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 1,792 800
Texture mapping units 112 40
Render output processors 32 16
Compute units 28 10
Pixel rate 25.6 GPixel/s 13.6 GPixel/s
Texture rate 89.6 GTexel/s 34 GTexel/s
Floating-point performance 2,867.2 GFLOPS 1,360 GFLOPS


Radeon HD 7950 Mac  vs
5770 Mac 
Memory clock speed 1,250 MHz 1,195 MHz
Effective memory clock speed 5,000 MHz 4,780 MHz
Memory bus 384 bit 128 bit
Memory 3,072 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 240 GB/s 76.48 GB/s

noise and power

TDP 200W 108W


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