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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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Significantly better PassMark score 4,764 vs 792 More than 6x better PassMark score
Much higher effective memory clock speed 5,000 MHz vs 1,656 MHz More than 3x higher effective memory clock speed
Much higher memory bandwidth 240 GB/s vs 105.98 GB/s More than 2.2x higher memory bandwidth
Better floating-point performance 2,867.2 GFLOPS vs 856.4 GFLOPS More than 3.2x better floating-point performance
More memory 3,072 MB vs 1,024 MB 3x more memory
Higher clock speed 800 MHz vs 669 MHz Around 20% higher clock speed
Higher texture rate 89.6 GTexel/s vs 21.4 GTexel/s Around 4.2x higher texture rate
Significantly more texture mapping units 112 vs 32 80 more texture mapping units
Significantly more shading units 1,792 vs 640 1152 more shading units
Significantly more compute units 28 vs 8 20 more compute units
Significantly higher memory clock speed 1,250 MHz vs 828 MHz More than 50% higher memory clock speed
Front view of Radeon HD 3850 X2

Reasons to consider the
ATi Radeon HD 3850 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Wider memory bus 512 bit vs 384 bit Around 35% wider memory bus
Lower TDP 140W vs 200W 30% lower TDP

Benchmarks Real world tests of Radeon HD 7950 vs 3850 X2

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Radeon HD 7950  vs 3850 X2 

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

Radeon HD 7950
240 GB/s
Radeon HD 3850 X2
105.98 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 3850 X2
21.4 GPixel/s

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

Radeon HD 7950
89.6 GTexel/s
Radeon HD 3850 X2
21.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7950
2,867.2 GFLOPS
Radeon HD 3850 X2
856.4 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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