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Differences What are the advantages of each

Front view of Radeon HD 5870 Mac

Reasons to consider the
ATi Radeon HD 5870 Mac

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Significantly higher memory bandwidth 153 GB/s vs 76.48 GB/s More than 2x higher memory bandwidth
Better floating-point performance 2,720 GFLOPS vs 1,360 GFLOPS 2x better floating-point performance
Higher texture rate 68 GTexel/s vs 34 GTexel/s 2x higher texture rate
More shading units 1,600 vs 800 Twice as many shading units
Higher pixel rate 27.2 GPixel/s vs 13.6 GPixel/s 2x higher pixel rate
More render output processors 32 vs 16 Twice as many render output processors
More texture mapping units 80 vs 40 Twice as many texture mapping units
More compute units 20 vs 10 Twice as many compute units
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
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 228W 2.1x lower TDP

Features Key features of the Radeon HD 5870 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 5870 Mac
27.2 GPixel/s
Radeon HD 5770 Mac
13.6 GPixel/s

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

Radeon HD 5870 Mac
68 GTexel/s
Radeon HD 5770 Mac
34 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 5870 Mac
2,720 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 5870 Mac  vs
5770 Mac 
GPU name Cypress Juniper
Market Desktop Desktop
Clock speed 850 MHz 850 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 1,600 800
Texture mapping units 80 40
Render output processors 32 16
Compute units 20 10
Pixel rate 27.2 GPixel/s 13.6 GPixel/s
Texture rate 68 GTexel/s 34 GTexel/s
Floating-point performance 2,720 GFLOPS 1,360 GFLOPS


Radeon HD 5870 Mac  vs
5770 Mac 
Memory clock speed 1,195 MHz 1,195 MHz
Effective memory clock speed 4,780 MHz 4,780 MHz
Memory bus 256 bit 128 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 153 GB/s 76.48 GB/s

noise and power

TDP 228W 108W


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word to 'ya motha
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