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Differences What are the advantages of each

Front view of Radeon HD 7850

Reasons to consider the
AMD Radeon HD 7850

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Better PassMark score 3,813 vs 2,534 More than 50% better PassMark score
Higher effective memory clock speed 4,800 MHz vs 4,200 MHz Around 15% higher effective memory clock speed
Higher memory clock speed 1,200 MHz vs 1,050 MHz Around 15% higher memory clock speed
Significantly lower TDP 130W vs 254W Around 50% lower TDP
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
Much higher memory bandwidth 268.8 GB/s vs 153.6 GB/s More than 75% higher memory bandwidth
More memory 4,096 MB vs 2,048 MB 2x more memory
Better floating-point performance 3,072 GFLOPS vs 1,761.3 GFLOPS Around 75% better floating-point performance
Significantly more render output processors 64 vs 32 Twice as many render output processors
Higher pixel rate 51.2 GPixel/s vs 27.52 GPixel/s More than 85% higher pixel rate
Significantly more shading units 1,920 vs 1,024 896 more shading units
Much wider memory bus 512 bit vs 256 bit 2x wider memory bus
Higher texture rate 76.8 GTexel/s vs 55 GTexel/s Around 40% higher texture rate
More texture mapping units 96 vs 64 32 more texture mapping units
More compute units 24 vs 16 8 more compute units

Benchmarks Real world tests of Radeon HD 7850 vs 6850 X2

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Radeon HD 7850  vs 6850 X2 

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

Radeon HD 7850
153.6 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 HD 7850
27.52 GPixel/s
Radeon HD 6850 X2
51.2 GPixel/s

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

Radeon HD 7850
55 GTexel/s
Radeon HD 6850 X2
76.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7850
1,761.3 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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