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Differences What are the advantages of each

Front view of Radeon HD 8670

Reasons to consider the
AMD Radeon HD 8670

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Significantly higher clock speed 1,000 MHz vs 810 MHz Around 25% higher clock speed
More memory 2,048 MB vs 1,024 MB 2x more memory
Higher effective memory clock speed 4,600 MHz vs 3,200 MHz Around 45% higher effective memory clock speed
Slightly better floating-point performance 768 GFLOPS vs 311 GFLOPS Around 2.5x better floating-point performance
Slightly higher pixel rate 8 GPixel/s vs 3.24 GPixel/s Around 2.5x higher pixel rate
Higher memory clock speed 1,150 MHz vs 800 MHz Around 45% higher memory clock speed
More shading units 384 vs 96 288 more shading units
Slightly more render output processors 8 vs 4 Twice as many render output processors
Front view of GeForce GT 630

Reasons to consider the
EVGA GeForce GT 630

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Slightly lower TDP 65W vs 75W Around 15% lower TDP

Features Key features of the Radeon HD 8670  vs GeForce GT 630 

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

Radeon HD 8670
73.6 GB/s
GeForce GT 630
51.2 GB/s
As memory bandwidth becomes the ultimate bounding condition, the gap between Richland and Haswell shrinks considerably.
Radeon HD 8670 | by Anand-Lal-Shimpi (Jun, 2013)

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

Radeon HD 8670
8 GPixel/s
GeForce GT 630
3.24 GPixel/s
Here the Radeon HD 8670D holds a 50% performance advantage over Intel's HD 4600 graphics.
Radeon HD 8670 | by Anand-Lal-Shimpi (Jun, 2013)

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

Radeon HD 8670
24 GTexel/s
GeForce GT 630
13 GTexel/s
While there isn't a substantial increase in GPU performance between Richland and Trinity, AMD's GPU performance lead over Ivy Bridge was big enough to withstand Haswell's arrival.
Radeon HD 8670 | by Anand-Lal-Shimpi (Jun, 2013)

floating point performance How fast the gpu can crunch numbers

Radeon HD 8670
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 8670  vs
GeForce GT 630 
GPU brand AMD Nvidia
GPU name Oland XT GF108
Market Desktop Desktop
Clock speed 1,000 MHz 810 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GT 630 810 MHz 1 GB

raw performance

Shading units 384 96
Texture mapping units 24 16
Render output processors 8 4
Pixel rate 8 GPixel/s 3.24 GPixel/s
Texture rate 24 GTexel/s 13 GTexel/s
Floating-point performance 768 GFLOPS 311 GFLOPS

memory

Radeon HD 8670  vs
GeForce GT 630 
Memory clock speed 1,150 MHz 800 MHz
Effective memory clock speed 4,600 MHz 3,200 MHz
Memory bus 128 bit 128 bit
Memory 2,048 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 73.6 GB/s 51.2 GB/s

noise and power

TDP 75W 65W

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