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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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Significantly higher memory bandwidth 240 GB/s vs 153 GB/s More than 55% higher memory bandwidth
More memory 3,072 MB vs 1,024 MB 3x more memory
Higher texture rate 89.6 GTexel/s vs 68 GTexel/s More than 30% higher texture rate
More texture mapping units 112 vs 80 32 more texture mapping units
Wider memory bus 384 bit vs 256 bit 50% wider memory bus
More compute units 28 vs 20 8 more compute units
Slightly more shading units 1,792 vs 1,600 192 more shading units
Lower TDP 200W vs 228W More than 10% lower TDP
Front view of Radeon HD 5870 Mac

Reasons to consider the
ATi Radeon HD 5870 Mac

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Slightly higher clock speed 850 MHz vs 800 MHz More than 5% higher clock speed

Features Key features of the Radeon HD 7950 Mac  vs 5870 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 5870 Mac
27.2 GPixel/s

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

Radeon HD 7950 Mac
89.6 GTexel/s
Radeon HD 5870 Mac
68 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7950 Mac
2,867.2 GFLOPS
Radeon HD 5870 Mac
2,720 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
5870 Mac 
GPU name Tahiti PRO Cypress
Market Desktop Desktop
Clock speed 800 MHz 850 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 1,792 1,600
Texture mapping units 112 80
Render output processors 32 32
Compute units 28 20
Pixel rate 25.6 GPixel/s 27.2 GPixel/s
Texture rate 89.6 GTexel/s 68 GTexel/s
Floating-point performance 2,867.2 GFLOPS 2,720 GFLOPS


Radeon HD 7950 Mac  vs
5870 Mac 
Memory clock speed 1,250 MHz 1,195 MHz
Effective memory clock speed 5,000 MHz 4,780 MHz
Memory bus 384 bit 256 bit
Memory 3,072 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 240 GB/s 153 GB/s

noise and power

TDP 200W 228W


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