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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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Higher clock speed 800 MHz vs 500 MHz 60% higher clock speed
Higher effective memory clock speed 5,000 MHz vs 2,800 MHz Around 80% higher effective memory clock speed
Higher memory bandwidth 240 GB/s vs 179.2 GB/s Around 35% higher memory bandwidth
Better floating-point performance 2,867.2 GFLOPS vs 1,600 GFLOPS Around 80% better floating-point performance
Higher texture rate 89.6 GTexel/s vs 40 GTexel/s Around 2.2x higher texture rate
Slightly more memory 3,072 MB vs 2,048 MB 50% more memory
Significantly higher memory clock speed 1,250 MHz vs 700 MHz Around 80% higher memory clock speed
Higher pixel rate 25.6 GPixel/s vs 16 GPixel/s More than 60% higher pixel rate
More texture mapping units 112 vs 80 32 more texture mapping units
More compute units 28 vs 20 8 more compute units
Front view of Mobility Radeon HD 4850 X2

Reasons to consider the
ATi Mobility Radeon HD 4850 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU

Features Key features of the Radeon HD 7950  vs Mobility Radeon HD 4850 X2 

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

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

Radeon HD 7950
25.6 GPixel/s

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

Radeon HD 7950
89.6 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7950
2,867.2 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

Specifications Full list of technical specs

gpu

Radeon HD 7950  vs
Mobility Radeon HD 4850 X2 
GPU brand AMD ATI
GPU name Tahiti PRO M98
Market Desktop Laptop
Clock speed 800 MHz 500 MHz
Is dual GPU No Yes
Reference card None None

raw performance

Shading units 1,792 1,600
Texture mapping units 112 80
Render output processors 32 32
Compute units 28 20
Pixel rate 25.6 GPixel/s 16 GPixel/s
Texture rate 89.6 GTexel/s 40 GTexel/s
Floating-point performance 2,867.2 GFLOPS 1,600 GFLOPS

memory

Radeon HD 7950  vs
Mobility Radeon HD 4850 X2 
Memory clock speed 1,250 MHz 700 MHz
Effective memory clock speed 5,000 MHz 2,800 MHz
Memory bus 384 bit 512 bit
Memory 3,072 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 240 GB/s 179.2 GB/s

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