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Differences What are the advantages of each

Front view of Mobility Radeon HD 3870 X2

Reasons to consider the
ATi Mobility Radeon HD 3870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Higher memory bandwidth 108.8 GB/s vs 51.2 GB/s More than 2x higher memory bandwidth
Significantly more render output processors 32 vs 4 28 more render output processors
Higher pixel rate 21.12 GPixel/s vs 3.24 GPixel/s More than 6.5x higher pixel rate
More shading units 640 vs 96 544 more shading units
Wider memory bus 512 bit vs 128 bit 4x wider memory bus
Front view of GeForce GT 630

Reasons to consider the
EVGA GeForce GT 630

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Higher clock speed 810 MHz vs 660 MHz Around 25% higher clock speed
Higher effective memory clock speed 3,200 MHz vs 1,700 MHz Around 90% higher effective memory clock speed
Lower TDP 65W vs 110W More than 40% lower TDP

Features Key features of the Mobility Radeon HD 3870 X2  vs GeForce GT 630 

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 630
3.24 GPixel/s

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

GeForce GT 630
12.96 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 630
311.04 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 3870 X2  vs
GeForce GT 630 
GPU brand ATI Nvidia
GPU name M88 GF108
Market Laptop Desktop
Clock speed 660 MHz 810 MHz
Is dual GPU Yes No
Reference card None Nvidia GeForce GT 630 810 MHz 1 GB

raw performance

Shading units 640 96
Texture mapping units 32 16
Render output processors 32 4
Pixel rate 21.12 GPixel/s 3.24 GPixel/s
Texture rate 21.12 GTexel/s 12.96 GTexel/s
Floating-point performance 844.8 GFLOPS 311.04 GFLOPS

memory

Mobility Radeon HD 3870 X2  vs
GeForce GT 630 
Memory clock speed 850 MHz 800 MHz
Effective memory clock speed 1,700 MHz 3,200 MHz
Memory bus 512 bit 128 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR3 GDDR5
Memory bandwidth 108.8 GB/s 51.2 GB/s

noise and power

TDP 110W 65W

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