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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 900 MHz More than 10% higher clock speed
Higher effective memory clock speed 4,800 MHz vs 4,200 MHz Around 15% higher effective memory clock speed
Higher memory clock speed 1,200 MHz vs 1,050 MHz Around 15% higher memory clock speed
Significantly lower TDP 175W vs 300W More than 40% lower TDP
Front view of Radeon HD 6870 X2

Reasons to consider the
AMD Radeon HD 6870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Much higher memory bandwidth 268.8 GB/s vs 153.6 GB/s More than 75% higher memory bandwidth
Better floating-point performance 4,032 GFLOPS vs 2,560 GFLOPS More than 55% better floating-point performance
Higher pixel rate 57.6 GPixel/s vs 32 GPixel/s 80% higher pixel rate
Significantly more render output processors 64 vs 32 Twice as many render output processors
Significantly more shading units 2,240 vs 1,280 960 more shading units
Much wider memory bus 512 bit vs 256 bit 2x wider memory bus
Higher texture rate 100.8 GTexel/s vs 80 GTexel/s More than 25% higher texture rate
More texture mapping units 112 vs 80 32 more texture mapping units
More compute units 28 vs 20 8 more compute units

Features Key features of the Radeon HD 7870  vs 6870 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 6870 X2
268.8 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 6870 X2
57.6 GPixel/s

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

Radeon HD 7870
80 GTexel/s
Radeon HD 6870 X2
100.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7870
2,560 GFLOPS
Radeon HD 6870 X2
4,032 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

Reviews Word on the street

Specifications Full list of technical specs

gpu

Radeon HD 7870  vs
6870 X2 
GPU brand AMD AMD
GPU name Pitcairn XT Barts XT
Market Desktop Desktop
Clock speed 1,000 MHz 900 MHz
Is dual GPU No Yes
Reference card None None

raw performance

Shading units 1,280 2,240
Texture mapping units 80 112
Render output processors 32 64
Compute units 20 28
Pixel rate 32 GPixel/s 57.6 GPixel/s
Texture rate 80 GTexel/s 100.8 GTexel/s
Floating-point performance 2,560 GFLOPS 4,032 GFLOPS

memory

Radeon HD 7870  vs
6870 X2 
Memory clock speed 1,200 MHz 1,050 MHz
Effective memory clock speed 4,800 MHz 4,200 MHz
Memory bus 256 bit 512 bit
Memory 2,048 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 153.6 GB/s 268.8 GB/s

noise and power

TDP 175W 300W

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