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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 GB/s More than 20% higher memory bandwidth
Significantly more render output processors 64 vs 32 Twice as many render output processors
Higher pixel rate 57.6 GPixel/s vs 33.5 GPixel/s More than 70% higher pixel rate
Better floating-point performance 4,032 GFLOPS vs 3,213 GFLOPS More than 25% better floating-point performance
Much wider memory bus 512 bit vs 256 bit 2x wider memory bus
More shading units 2,240 vs 1,536 704 more shading units
Front view of GeForce GTX 770

Reasons to consider the
Nvidia GeForce GTX 770

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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
Higher clock speed 1,046 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
Higher texture rate 134 GTexel/s vs 100.8 GTexel/s Around 35% higher texture rate
More texture mapping units 128 vs 112 16 more texture mapping units
Lower TDP 230W vs 300W Around 25% lower TDP

Features Key features of the Radeon HD 6870 X2  vs GeForce GTX 770 

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 770
224 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 770
33.5 GPixel/s

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

Radeon HD 6870 X2
100.8 GTexel/s
GeForce GTX 770
134 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6870 X2
4,032 GFLOPS
GeForce GTX 770
3,213 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 770 
GPU brand AMD Nvidia
GPU name Barts XT GK104
Market Desktop Desktop
Clock speed 900 MHz 1,046 MHz
Is dual GPU Yes No
Reference card None None

raw performance

Shading units 2,240 1,536
Texture mapping units 112 128
Render output processors 64 32
Pixel rate 57.6 GPixel/s 33.5 GPixel/s
Texture rate 100.8 GTexel/s 134 GTexel/s
Floating-point performance 4,032 GFLOPS 3,213 GFLOPS

memory

Radeon HD 6870 X2  vs
GeForce GTX 770 
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 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 268.8 GB/s 224 GB/s

noise and power

TDP 300W 230W

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