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Differences What are the advantages of each

Front view of Radeon HD 4850

Reasons to consider the
ATi Radeon HD 4850

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Higher clock speed 625 MHz vs 500 MHz 25% higher clock speed
Higher memory clock speed 993 MHz vs 700 MHz More than 40% higher memory clock speed
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
Higher memory bandwidth 179.2 GB/s vs 63.55 GB/s More than 2.8x higher memory bandwidth
More memory 2,048 MB vs 512 MB 4x more memory
Higher effective memory clock speed 2,800 MHz vs 1,986 MHz More than 40% higher effective memory clock speed
More shading units 1,600 vs 800 Twice as many shading units
More render output processors 32 vs 16 Twice as many render output processors
More texture mapping units 80 vs 40 Twice as many texture mapping units
More compute units 20 vs 10 Twice as many compute units
Wider memory bus 512 bit vs 256 bit 2x wider memory bus

Features Key features of the Radeon HD 4850  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 4850
10 GPixel/s

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

Radeon HD 4850
25 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4850
1,000 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 4850  vs
Mobility Radeon HD 4850 X2 
GPU brand ATI ATI
GPU name RV770 M98
Market Desktop Laptop
Clock speed 625 MHz 500 MHz
Is dual GPU No Yes
Reference card None None

raw performance

Shading units 800 1,600
Texture mapping units 40 80
Render output processors 16 32
Compute units 10 20
Pixel rate 10 GPixel/s 16 GPixel/s
Texture rate 25 GTexel/s 40 GTexel/s
Floating-point performance 1,000 GFLOPS 1,600 GFLOPS

memory

Radeon HD 4850  vs
Mobility Radeon HD 4850 X2 
Memory clock speed 993 MHz 700 MHz
Effective memory clock speed 1,986 MHz 2,800 MHz
Memory bus 256 bit 512 bit
Memory 512 MB 2,048 MB
Memory type GDDR3 GDDR5
Memory bandwidth 63.55 GB/s 179.2 GB/s

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