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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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Higher effective memory clock speed 4,780 MHz vs 3,400 MHz More than 40% higher effective memory clock speed
Higher clock speed 850 MHz vs 750 MHz Around 15% higher clock speed
Significantly higher memory clock speed 1,195 MHz vs 850 MHz More than 40% higher memory clock speed
Lower TDP 108W vs 150W Around 30% lower TDP
Front view of Radeon HD 4870 Mac

Reasons to consider the
ATi Radeon HD 4870 Mac

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Higher memory bandwidth 108.8 GB/s vs 76.48 GB/s More than 40% higher memory bandwidth
Wider memory bus 256 bit vs 128 bit 2x wider memory bus

Features Key features of the Radeon HD 5770 Mac  vs 4870 Mac 

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

Radeon HD 5770 Mac
76.48 GB/s
Radeon HD 4870 Mac
108.8 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
Radeon HD 4870 Mac
12 GPixel/s

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

Radeon HD 5770 Mac
34 GTexel/s
Radeon HD 4870 Mac
30 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 5770 Mac
1,360 GFLOPS
Radeon HD 4870 Mac
1,200 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
4870 Mac 
GPU brand ATI ATI
GPU name Juniper RV770
Market Desktop Desktop
Clock speed 850 MHz 750 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 800 800
Texture mapping units 40 40
Render output processors 16 16
Compute units 10 10
Pixel rate 13.6 GPixel/s 12 GPixel/s
Texture rate 34 GTexel/s 30 GTexel/s
Floating-point performance 1,360 GFLOPS 1,200 GFLOPS

memory

Radeon HD 5770 Mac  vs
4870 Mac 
Memory clock speed 1,195 MHz 850 MHz
Effective memory clock speed 4,780 MHz 3,400 MHz
Memory bus 128 bit 256 bit
Memory 1,024 MB 512 MB
Memory type GDDR5 GDDR5
Memory bandwidth 76.48 GB/s 108.8 GB/s

noise and power

TDP 108W 150W

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