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Differences What are the advantages of each

Front view of Radeon HD 3870

Reasons to consider the
Sapphire Radeon HD 3870

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Higher memory bandwidth 76.8 GB/s vs 51.2 GB/s Around 50% higher memory bandwidth
Higher pixel rate 13.2 GPixel/s vs 3.24 GPixel/s More than 4x higher pixel rate
Significantly higher memory clock speed 1,200 MHz vs 800 MHz 50% higher memory clock speed
More render output processors 16 vs 4 12 more render output processors
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
More shading units 320 vs 96 224 more shading units
Front view of GeForce GT 630

Reasons to consider the
EVGA GeForce GT 630

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Higher effective memory clock speed 3,200 MHz vs 2,400 MHz Around 35% higher effective memory clock speed
Lower TDP 65W vs 106W Around 40% lower TDP

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

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

Radeon HD 3870
76.8 GB/s
GeForce GT 630
51.2 GB/s

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

Radeon HD 3870
13.2 GPixel/s
GeForce GT 630
3.24 GPixel/s

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

Radeon HD 3870
13.2 GTexel/s
GeForce GT 630
12.96 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 3870
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


Radeon HD 3870  vs
GeForce GT 630 
GPU brand ATI Nvidia
GPU name RV670 XT GF108
Market Desktop Desktop
Clock speed 825 MHz 810 MHz
Is dual GPU No No
Reference card ATi Radeon HD 3870 777 MHz 512 MB Nvidia GeForce GT 630 810 MHz 1 GB

raw performance

Shading units 320 96
Texture mapping units 16 16
Render output processors 16 4
Pixel rate 13.2 GPixel/s 3.24 GPixel/s
Texture rate 13.2 GTexel/s 12.96 GTexel/s
Floating-point performance 528 GFLOPS 311.04 GFLOPS


Radeon HD 3870  vs
GeForce GT 630 
Memory clock speed 1,200 MHz 800 MHz
Effective memory clock speed 2,400 MHz 3,200 MHz
Memory bus 256 bit 128 bit
Memory 512 MB 1,024 MB
Memory type GDDR4 GDDR5
Memory bandwidth 76.8 GB/s 51.2 GB/s

noise and power

TDP 106W 65W

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