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Differences What are the advantages of each

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 memory bandwidth 268.8 GB/s vs 224.4 GB/s Around 20% higher memory bandwidth
Much wider memory bus 512 bit vs 256 bit 2x wider memory bus
Slightly better floating-point performance 4,032 GFLOPS vs 3,494 GFLOPS More than 15% better floating-point performance
More shading units 2,240 vs 1,664 576 more shading units
More render output processors 64 vs 56 8 more render output processors
Front view of GeForce GTX 970

Reasons to consider the
Nvidia GeForce GTX 970

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Much higher effective memory clock speed 7,012 MHz vs 4,200 MHz More than 65% higher effective memory clock speed
More memory 4,096 MB vs 2,048 MB 2x more memory
Higher clock speed 1,050 MHz vs 900 MHz More than 15% higher clock speed
Much higher memory clock speed 1,753 MHz vs 1,050 MHz More than 65% higher memory clock speed
Much lower TDP 148W vs 300W 2x lower TDP

Features Key features of the Radeon HD 6870 X2  vs GeForce GTX 970 

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

Radeon HD 6870 X2
268.8 GB/s
GeForce GTX 970
224.4 GB/s

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

Radeon HD 6870 X2
57.6 GPixel/s
GeForce GTX 970
58.8 GPixel/s

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

Radeon HD 6870 X2
100.8 GTexel/s
GeForce GTX 970
109.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6870 X2
4,032 GFLOPS
GeForce GTX 970
3,494 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 6870 X2  vs
GeForce GTX 970 
GPU brand AMD Nvidia
GPU name Barts XT GM204
Market Desktop Desktop
Clock speed 900 MHz 1,050 MHz
Is dual GPU Yes No
Reference card None None

raw performance

Shading units 2,240 1,664
Texture mapping units 112 104
Render output processors 64 56
Pixel rate 57.6 GPixel/s 58.8 GPixel/s
Texture rate 100.8 GTexel/s 109.2 GTexel/s
Floating-point performance 4,032 GFLOPS 3,494 GFLOPS

memory

Radeon HD 6870 X2  vs
GeForce GTX 970 
Memory clock speed 1,050 MHz 1,753 MHz
Effective memory clock speed 4,200 MHz 7,012 MHz
Memory bus 512 bit 256 bit
Memory 2,048 MB 4,096 MB
Memory type GDDR5 GDDR5
Memory bandwidth 268.8 GB/s 224.4 GB/s

noise and power

TDP 300W 148W

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