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Differences What are the advantages of each

Front view of Radeon HD 4890

Reasons to consider the
XFX Radeon HD 4890

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Significantly higher clock speed 1,000 MHz vs 500 MHz 2x higher clock speed
Higher effective memory clock speed 4,000 MHz vs 2,800 MHz Around 45% higher effective memory clock speed
Higher memory clock speed 1,000 MHz vs 700 MHz Around 45% 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 128 GB/s Around 40% higher memory bandwidth
Slightly more memory 2,048 MB vs 1,024 MB 2x more memory
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 4890  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 4890
16 GPixel/s

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

Radeon HD 4890
40 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4890
1,600 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 4890  vs
Mobility Radeon HD 4850 X2 
GPU brand ATI ATI
GPU name RV790 M98
Market Desktop Laptop
Clock speed 1,000 MHz 500 MHz
Is dual GPU No Yes
Reference card ATi Radeon HD 4890 850 MHz 1 GB None

raw performance

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

memory

Radeon HD 4890  vs
Mobility Radeon HD 4850 X2 
Memory clock speed 1,000 MHz 700 MHz
Effective memory clock speed 4,000 MHz 2,800 MHz
Memory bus 256 bit 512 bit
Memory 1,024 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 128 GB/s 179.2 GB/s

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