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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 pixel rate 57.6 GPixel/s vs 41.4 GPixel/s Around 40% higher pixel rate
More render output processors 64 vs 48 16 more render output processors
Wider memory bus 512 bit vs 384 bit Around 35% wider memory bus
Front view of GeForce GTX 780

Reasons to consider the
Nvidia GeForce GTX 780

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Significantly higher effective memory clock speed 6,008 MHz vs 4,200 MHz Around 45% higher effective memory clock speed
Higher texture rate 165.7 GTexel/s vs 100.8 GTexel/s Around 65% higher texture rate
Significantly more texture mapping units 192 vs 112 80 more texture mapping units
More memory 3,072 MB vs 2,048 MB 50% more memory
Higher memory bandwidth 288.4 GB/s vs 268.8 GB/s More than 5% higher memory bandwidth
Significantly higher memory clock speed 1,502 MHz vs 1,050 MHz Around 45% higher memory clock speed
Lower TDP 250W vs 300W More than 15% lower TDP

Features Key features of the Radeon HD 6870 X2  vs GeForce GTX 780 

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 780
288.4 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 780
41.4 GPixel/s

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

Radeon HD 6870 X2
100.8 GTexel/s
GeForce GTX 780
165.7 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6870 X2
4,032 GFLOPS
GeForce GTX 780
3,977 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 780 
GPU brand AMD Nvidia
GPU name Barts XT GK110
Market Desktop Desktop
Clock speed 900 MHz 863 MHz
Is dual GPU Yes No
Reference card None None

raw performance

Shading units 2,240 2,304
Texture mapping units 112 192
Render output processors 64 48
Pixel rate 57.6 GPixel/s 41.4 GPixel/s
Texture rate 100.8 GTexel/s 165.7 GTexel/s
Floating-point performance 4,032 GFLOPS 3,977 GFLOPS

memory

Radeon HD 6870 X2  vs
GeForce GTX 780 
Memory clock speed 1,050 MHz 1,502 MHz
Effective memory clock speed 4,200 MHz 6,008 MHz
Memory bus 512 bit 384 bit
Memory 2,048 MB 3,072 MB
Memory type GDDR5 GDDR5
Memory bandwidth 268.8 GB/s 288.4 GB/s

noise and power

TDP 300W 250W

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