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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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Significantly higher effective memory clock speed 4,000 MHz vs 1,800 MHz Around 2.2x higher effective memory clock speed
Higher memory bandwidth 64 GB/s vs 14.4 GB/s Around 4.5x higher memory bandwidth
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Higher memory clock speed 1,000 MHz vs 900 MHz More than 10% higher memory clock speed
Front view of GeForce GT 630 PCIe x8

Reasons to consider the
Nvidia GeForce GT 630 PCIe x8

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Higher clock speed 902 MHz vs 800 MHz Around 15% higher clock speed
More memory 2,048 MB vs 1,024 MB 2x more memory
Lower TDP 25W vs 66W 2.6x lower TDP

Features Key features of the Radeon HD 6670  vs GeForce GT 630 PCIe x8 

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

Other than DDR4 memory, Skylake would also feature PCIe 4.0 functionality which doubles the bandwidth over PCIe 3.0 but it is known that no GPU currently takes benefit from the extra bandwidth available on PCIe 3.0 or even 2.0 so only if NVIDIA’s Maxwell requires massive bandwidth from the PCIe 4.0 slots would we see any real time performance benefit.
GeForce GT 630 PCIe x8 | by hassan-mujtaba (Jul, 2013)

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 PCIe x8
7.22 GPixel/s
In general AMD is able to either deliver the same performance at much better quality or better performance at the same quality as Ivy Bridge.
GeForce GT 630 PCIe x8 | by Anand-Lal-Shimpi (Sep, 2012)

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

Radeon HD 6670
19.2 GTexel/s
GeForce GT 630 PCIe x8
14.4 GTexel/s
Alot of speculation built up around the new card that whether they would power the high-end or low-end lineup of next generation cards and it looks like the GK208 was just a low end chip with high-end compute capabilities of the GK 110 core that would end up in the new GT 640 and GT 630 graphic cards.
GeForce GT 630 PCIe x8 | by hassan-mujtaba (Jun, 2013)

floating point performance How fast the gpu can crunch numbers

Radeon HD 6670
768 GFLOPS
GeForce GT 630 PCIe x8
692.7 GFLOPS
No, three- and four-way setups are often the domain of power users in need of massive floating-point math.
GeForce GT 630 PCIe x8 | by Don-Woligroski (Mar, 2013)

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

Interestingly enough, this is one area where the mobile GPUs have moved ahead of the desktop world - NVIDIA's Tegra GPUs reuse programmable pixel shader ALUs for frame buffer ops.
GeForce GT 630 PCIe x8 | by Anand-Lal-Shimpi (Mar, 2013)

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 PCIe x8 
GPU brand AMD Nvidia
GPU name Turks XT GK208
Market Desktop Desktop
Clock speed 800 MHz 902 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 480 384
Texture mapping units 24 16
Render output processors 8 8
Pixel rate 6.4 GPixel/s 7.22 GPixel/s
Texture rate 19.2 GTexel/s 14.4 GTexel/s
Floating-point performance 768 GFLOPS 692.7 GFLOPS

memory

Radeon HD 6670  vs
GeForce GT 630 PCIe x8 
Memory clock speed 1,000 MHz 900 MHz
Effective memory clock speed 4,000 MHz 1,800 MHz
Memory bus 128 bit 64 bit
Memory 1,024 MB 2,048 MB
Memory type GDDR5 DDR3
Memory bandwidth 64 GB/s 14.4 GB/s

noise and power

TDP 66W 25W

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