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Differences What are the advantages of each

Front view of Radeon HD 7670M

Reasons to consider the
AMD Radeon HD 7670M

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Significantly higher effective memory clock speed 3,600 MHz vs 1,600 MHz 2.2x higher effective memory clock speed
Higher memory bandwidth 57.6 GB/s vs 12.8 GB/s Around 4.5x higher memory bandwidth
Slightly higher pixel rate 9.6 GPixel/s vs 3.19 GPixel/s More than 3x higher pixel rate
More render output processors 16 vs 8 Twice as many render output processors
Slightly more shading units 480 vs 192 288 more shading units
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Higher memory clock speed 900 MHz vs 800 MHz Around 15% higher memory clock speed
Front view of GeForce GT 720

Reasons to consider the
Nvidia GeForce GT 720

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Significantly higher clock speed 797 MHz vs 600 MHz Around 35% higher clock speed

Features Key features of the Radeon HD 7670M  vs GeForce GT 720 

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

Radeon HD 7670M
57.6 GB/s
GeForce GT 720
12.8 GB/s
Entries of a 100W Kaveri APU called (KV Spectre Desktop 100W 1305) were spotted on Sisoft Sandra’s benchmark portal along with some specifications regarding the GPU, memory and a few bandwidth tests.
Radeon HD 7670M | by hassan-mujtaba (Sep, 2013)

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

Radeon HD 7670M
9.6 GPixel/s
GeForce GT 720
3.19 GPixel/s
Since Core M is the first 14nm device, it will meet the demands of next iteration of mobility devices boasting better performance and efficiency.
Radeon HD 7670M | by hassan-mujtaba (Sep, 2014)

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

Radeon HD 7670M
14.4 GTexel/s
GeForce GT 720
12.8 GTexel/s
Of course efficiency increases can only take you so far, so along with the above changes Intel is also making some more fundamental improvements to Broadwell’s math performance.
Radeon HD 7670M | by Ryan-Smith (Aug, 2014)

floating point performance How fast the gpu can crunch numbers

Radeon HD 7670M
576 GFLOPS
GeForce GT 720
306 GFLOPS
Floating point multiplication is seeing a sizable reduction in instruction latency from 5 cycles to 3 cycles, and meanwhile division performance is being improved by the use of an even larger Radix-1024 (10bit) divider.
Radeon HD 7670M | by Ryan-Smith (Aug, 2014)

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

A recent founding by Planet3DNow reveals that the top Kaveri APU parts won’t be restricted to only 512 Stream processors and can feature upto 832 Stream processors.
Radeon HD 7670M | by hassan-mujtaba (Sep, 2013)

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

Unfortunately it's also difficult to determine how many ROPs or TMUs are powering it, but the most recent version of GPU-Z pegs it at 16 ROPs which would theoretically work out to 64 TMUs.
Radeon HD 7670M | by Dustin-Sklavos (Mar, 2012)

Specifications Full list of technical specs

gpu

Radeon HD 7670M  vs
GeForce GT 720 
GPU brand AMD Nvidia
GPU name Thames GK118
Market Laptop Desktop
Clock speed 600 MHz 797 MHz
Is dual GPU No No
Reference card AMD Radeon HD 7670M 600 MHz 1 GB None

raw performance

Shading units 480 192
Texture mapping units 24 16
Render output processors 16 8
Pixel rate 9.6 GPixel/s 3.19 GPixel/s
Texture rate 14.4 GTexel/s 12.8 GTexel/s
Floating-point performance 576 GFLOPS 306 GFLOPS

memory

Radeon HD 7670M  vs
GeForce GT 720 
Memory clock speed 900 MHz 800 MHz
Effective memory clock speed 3,600 MHz 1,600 MHz
Memory bus 128 bit 64 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR5 DDR3
Memory bandwidth 57.6 GB/s 12.8 GB/s

noise and power

TDP 20W 19W

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