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Differences What are the advantages of each

Front view of Radeon R9 280X

Reasons to consider the
Generic Radeon R9 280X

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Significantly better PassMark score 5,809 vs 2,534 More than 2.2x better PassMark score
Significantly higher effective memory clock speed 6,000 MHz vs 4,200 MHz Around 45% higher effective memory clock speed
Higher texture rate 128 GTexel/s vs 76.8 GTexel/s More than 65% higher texture rate
Better floating-point performance 4,096 GFLOPS vs 3,072 GFLOPS Around 35% better floating-point performance
Higher memory bandwidth 288 GB/s vs 268.8 GB/s More than 5% higher memory bandwidth
Significantly higher memory clock speed 1,500 MHz vs 1,050 MHz Around 45% higher memory clock speed
More texture mapping units 128 vs 96 32 more texture mapping units
More compute units 32 vs 24 8 more compute units
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
Significantly more render output processors 64 vs 32 Twice as many render output processors
More memory 4,096 MB vs 3,072 MB Around 35% more memory
Higher pixel rate 51.2 GPixel/s vs 32 GPixel/s More than 60% higher pixel rate
Wider memory bus 512 bit vs 384 bit Around 35% wider memory bus

Benchmarks Real world tests of Radeon R9 280X vs HD 6850 X2

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Radeon R9 280X  vs HD 6850 X2 

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

Radeon R9 280X
288 GB/s
Radeon HD 6850 X2
268.8 GB/s

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

Radeon R9 280X
32 GPixel/s
Radeon HD 6850 X2
51.2 GPixel/s

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

Radeon R9 280X
128 GTexel/s
Radeon HD 6850 X2
76.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R9 280X
4,096 GFLOPS
Radeon HD 6850 X2
3,072 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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