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Differences What are the advantages of each

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
Significantly higher memory bandwidth 179.2 GB/s vs 28.8 GB/s Around 6.2x higher memory bandwidth
Higher effective memory clock speed 2,800 MHz vs 1,800 MHz More than 55% higher effective memory clock speed
More shading units 1,600 vs 384 1216 more shading units
Slightly more memory 2,048 MB vs 1,024 MB 2x more memory
Better floating-point performance 1,600 GFLOPS vs 692.7 GFLOPS More than 2.2x better floating-point performance
More texture mapping units 80 vs 32 48 more texture mapping units
More render output processors 32 vs 16 Twice as many render output processors
Slightly higher pixel rate 16 GPixel/s vs 7.22 GPixel/s Around 2.2x higher pixel rate
Wider memory bus 512 bit vs 128 bit 4x wider memory bus
Front view of GeForce GT 640

Reasons to consider the
Leadtek GeForce GT 640

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Significantly higher clock speed 902 MHz vs 500 MHz More than 80% higher clock speed
Higher memory clock speed 900 MHz vs 700 MHz Around 30% higher memory clock speed

Features Key features of the Mobility Radeon HD 4850 X2  vs GeForce GT 640 

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

GeForce GT 640
7.22 GPixel/s

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

GeForce GT 640
28.86 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 640
692.7 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

Mobility Radeon HD 4850 X2  vs
GeForce GT 640 
GPU brand ATI Nvidia
GPU name M98 GK107
Market Laptop Desktop
Clock speed 500 MHz 902 MHz
Is dual GPU Yes No
Reference card None Nvidia GeForce GT 640 902 MHz 2 GB

raw performance

Shading units 1,600 384
Texture mapping units 80 32
Render output processors 32 16
Pixel rate 16 GPixel/s 7.22 GPixel/s
Texture rate 40 GTexel/s 28.86 GTexel/s
Floating-point performance 1,600 GFLOPS 692.7 GFLOPS

memory

Mobility Radeon HD 4850 X2  vs
GeForce GT 640 
Memory clock speed 700 MHz 900 MHz
Effective memory clock speed 2,800 MHz 1,800 MHz
Memory bus 512 bit 128 bit
Memory 2,048 MB 1,024 MB
Memory type GDDR5 DDR3
Memory bandwidth 179.2 GB/s 28.8 GB/s

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