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Differences What are the advantages of each

Front view of Radeon HD 6850 X2

Reasons to consider the
Generic Radeon HD 6850 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
More memory 4,096 MB vs 2,048 MB 2x more memory
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 51.2 GPixel/s vs 33.5 GPixel/s Around 55% higher pixel rate
Much wider memory bus 512 bit vs 256 bit 2x wider memory bus
More shading units 1,920 vs 1,536 384 more shading units
Front view of GeForce GTX 770

Reasons to consider the
Nvidia GeForce GTX 770

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Significantly better PassMark score 6,099 vs 2,534 Around 2.5x better PassMark score
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 800 MHz More than 30% higher clock speed
Higher texture rate 134 GTexel/s vs 76.8 GTexel/s Around 75% higher texture rate
Much higher memory clock speed 1,753 MHz vs 1,050 MHz More than 65% higher memory clock speed
More texture mapping units 128 vs 96 32 more texture mapping units
Lower TDP 230W vs 254W Around 10% lower TDP

Benchmarks Real world tests of Radeon HD 6850 X2 vs GeForce GTX 770

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Radeon HD 6850 X2  vs GeForce GTX 770 

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

Radeon HD 6850 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 6850 X2
51.2 GPixel/s
GeForce GTX 770
33.5 GPixel/s

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

Radeon HD 6850 X2
76.8 GTexel/s
GeForce GTX 770
134 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6850 X2
3,072 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

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