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Differences What are the advantages of each

Front view of Radeon HD 7770

Reasons to consider the
AMD Radeon HD 7770

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Higher clock speed 1,000 MHz vs 850 MHz Around 20% higher clock speed
Lower TDP 80W vs 108W More than 25% lower TDP
Front view of Radeon HD 5770 Mac

Reasons to consider the
ATi Radeon HD 5770 Mac

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Slightly higher effective memory clock speed 4,780 MHz vs 4,500 MHz More than 5% higher effective memory clock speed
Slightly more shading units 800 vs 640 160 more shading units
Slightly higher memory clock speed 1,195 MHz vs 1,125 MHz More than 5% higher memory clock speed

Features Key features of the Radeon HD 7770  vs 5770 Mac 

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

Radeon HD 7770
72 GB/s
Radeon HD 5770 Mac
76.48 GB/s

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

Radeon HD 7770
16 GPixel/s
Radeon HD 5770 Mac
13.6 GPixel/s

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

Radeon HD 7770
40 GTexel/s
Radeon HD 5770 Mac
34 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7770
1,280 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

gpu

Radeon HD 7770  vs
5770 Mac 
GPU brand AMD ATI
GPU name Cape Verde XT Juniper
Market Desktop Desktop
Clock speed 1,000 MHz 850 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 640 800
Texture mapping units 40 40
Render output processors 16 16
Compute units 10 10
Pixel rate 16 GPixel/s 13.6 GPixel/s
Texture rate 40 GTexel/s 34 GTexel/s
Floating-point performance 1,280 GFLOPS 1,360 GFLOPS

memory

Radeon HD 7770  vs
5770 Mac 
Memory clock speed 1,125 MHz 1,195 MHz
Effective memory clock speed 4,500 MHz 4,780 MHz
Memory bus 128 bit 128 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 72 GB/s 76.48 GB/s

noise and power

TDP 80W 108W

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