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Differences What are the advantages of each

Front view of Radeon HD 6670

Reasons to consider the
AMD Radeon HD 6670

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Higher effective memory clock speed 4,000 MHz vs 3,200 MHz 25% higher effective memory clock speed
Higher memory clock speed 1,000 MHz vs 800 MHz 25% higher memory clock speed
More shading units 480 vs 96 384 more shading units
Front view of GeForce GT 630

Reasons to consider the
EVGA GeForce GT 630

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GPUBoss is not aware of any important advantages of the EVGA GeForce GT 630 vs the AMD Radeon HD 6670.

Features Key features of the Radeon HD 6670  vs GeForce GT 630 

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

Radeon HD 6670
64 GB/s
GeForce GT 630
51.2 GB/s
Both overclocks are nice, especially the GDDR5 memory with its high-clock potential can help a lot.
Radeon HD 6670 | by techPowerUp! (Apr, 2011)

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

Radeon HD 6670
6.4 GPixel/s
GeForce GT 630
3.24 GPixel/s
In this performance segment DirectX 11 support really doesn't offer much of a benefit, instead of improving performance by using the new API, all developers use it to add eye candy which reduces performance even more.
Radeon HD 6670 | by techPowerUp! (Apr, 2011)

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

Radeon HD 6670
19.2 GTexel/s
GeForce GT 630
13 GTexel/s
For just $10 more you can get a HD 5750 and $20 more gets you a HD 5770, both of which offer more performance.
Radeon HD 6670 | by techPowerUp! (Apr, 2011)

floating point performance How fast the gpu can crunch numbers

Radeon HD 6670
768 GFLOPS
GeForce GT 630
311 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 6670  vs
GeForce GT 630 
GPU brand AMD Nvidia
GPU name Turks XT GF108
Market Desktop Desktop
Clock speed 800 MHz 810 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GT 630 810 MHz 1 GB

raw performance

Shading units 480 96
Texture mapping units 24 16
Render output processors 8 4
Pixel rate 6.4 GPixel/s 3.24 GPixel/s
Texture rate 19.2 GTexel/s 13 GTexel/s
Floating-point performance 768 GFLOPS 311 GFLOPS

memory

Radeon HD 6670  vs
GeForce GT 630 
Memory clock speed 1,000 MHz 800 MHz
Effective memory clock speed 4,000 MHz 3,200 MHz
Memory bus 128 bit 128 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 64 GB/s 51.2 GB/s

noise and power

TDP 66W 65W

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