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Differences What are the advantages of each

Front view of Radeon HD 7970

Reasons to consider the
AMD Radeon HD 7970

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Higher effective memory clock speed 5,500 MHz vs 4,200 MHz More than 30% higher effective memory clock speed
More memory 3,072 MB vs 2,048 MB 50% more memory
Higher texture rate 118.4 GTexel/s vs 100.8 GTexel/s More than 15% higher texture rate
Higher memory clock speed 1,375 MHz vs 1,050 MHz More than 30% higher memory clock speed
More texture mapping units 128 vs 112 16 more texture mapping units
Slightly more compute units 32 vs 28 4 more compute units
Lower TDP 250W vs 300W More than 15% 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
Higher pixel rate 57.6 GPixel/s vs 29.6 GPixel/s Around 95% higher pixel rate
Significantly more render output processors 64 vs 32 Twice as many render output processors
Wider memory bus 512 bit vs 384 bit Around 35% wider memory bus
Slightly more shading units 2,240 vs 2,048 192 more shading units

Features Key features of the Radeon HD 7970  vs 6870 X2 

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

Radeon HD 7970
264 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 7970
29.6 GPixel/s
Radeon HD 6870 X2
57.6 GPixel/s

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

Radeon HD 7970
118.4 GTexel/s
Radeon HD 6870 X2
100.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7970
3,789 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 7970  vs
6870 X2 
GPU brand AMD AMD
GPU name Tahiti XT Barts XT
Market Desktop Desktop
Clock speed 925 MHz 900 MHz
Is dual GPU No Yes
Reference card None None

raw performance

Shading units 2,048 2,240
Texture mapping units 128 112
Render output processors 32 64
Compute units 32 28
Pixel rate 29.6 GPixel/s 57.6 GPixel/s
Texture rate 118.4 GTexel/s 100.8 GTexel/s
Floating-point performance 3,789 GFLOPS 4,032 GFLOPS

memory

Radeon HD 7970  vs
6870 X2 
Memory clock speed 1,375 MHz 1,050 MHz
Effective memory clock speed 5,500 MHz 4,200 MHz
Memory bus 384 bit 512 bit
Memory 3,072 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 264 GB/s 268.8 GB/s

noise and power

TDP 250W 300W

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