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Differences What are the advantages of each

Front view of Radeon HD 7870

Reasons to consider the
AMD Radeon HD 7870

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Higher clock speed 1,000 MHz vs 850 MHz Around 20% higher clock speed
Front view of Radeon HD 5770 X2

Reasons to consider the
Generic Radeon HD 5770 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
More shading units 1,600 vs 1,280 320 more shading units

Features Key features of the Radeon HD 7870  vs 5770 X2 

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

Radeon HD 7870
153.6 GB/s
Radeon HD 5770 X2
153.6 GB/s

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

Radeon HD 7870
32 GPixel/s
Radeon HD 5770 X2
27.2 GPixel/s

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

Radeon HD 7870
80 GTexel/s
Radeon HD 5770 X2
68 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7870
2,560 GFLOPS
Radeon HD 5770 X2
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

gpu

Radeon HD 7870  vs
5770 X2 
GPU brand AMD ATI
GPU name Pitcairn XT Juniper
Market Desktop Desktop
Clock speed 1,000 MHz 850 MHz
Is dual GPU No Yes
Reference card None ATi Radeon HD 5770 X2 850 MHz 2 GB

raw performance

Shading units 1,280 1,600
Texture mapping units 80 80
Render output processors 32 32
Compute units 20 20
Pixel rate 32 GPixel/s 27.2 GPixel/s
Texture rate 80 GTexel/s 68 GTexel/s
Floating-point performance 2,560 GFLOPS 2,720 GFLOPS

memory

Radeon HD 7870  vs
5770 X2 
Memory clock speed 1,200 MHz 1,200 MHz
Effective memory clock speed 4,800 MHz 4,800 MHz
Memory bus 256 bit 256 bit
Memory 2,048 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 153.6 GB/s 153.6 GB/s

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