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Differences What are the advantages of each

Front view of Radeon HD 7950

Reasons to consider the
AMD Radeon HD 7950

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Better PassMark score 4,764 vs 2,534 Around 90% better PassMark score
Higher effective memory clock speed 5,000 MHz vs 4,200 MHz Around 20% higher effective memory clock speed
Higher memory clock speed 1,250 MHz vs 1,050 MHz Around 20% higher memory clock speed
More texture mapping units 112 vs 96 16 more texture mapping units
Slightly more compute units 28 vs 24 4 more compute units
Lower TDP 200W vs 254W More than 20% 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
Higher pixel rate 51.2 GPixel/s vs 25.6 GPixel/s 2x higher pixel rate
Significantly more render output processors 64 vs 32 Twice as many render output processors
Higher memory bandwidth 268.8 GB/s vs 240 GB/s More than 10% higher memory bandwidth
More memory 4,096 MB vs 3,072 MB Around 35% more memory
Wider memory bus 512 bit vs 384 bit Around 35% wider memory bus

Benchmarks Real world tests of Radeon HD 7950 vs 6850 X2

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Radeon HD 7950  vs 6850 X2 

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

Radeon HD 7950
240 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 7950
25.6 GPixel/s
Radeon HD 6850 X2
51.2 GPixel/s

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

Radeon HD 7950
89.6 GTexel/s
Radeon HD 6850 X2
76.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7950
2,867.2 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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