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Differences What are the advantages of each

Front view of GeForce GTS 250M

Reasons to consider the
Nvidia GeForce GTS 250M

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Significantly higher memory bandwidth 51.2 GB/s vs 12.8 GB/s More than 4x higher memory bandwidth
Higher effective memory clock speed 3,200 MHz vs 1,600 MHz 2x higher effective memory clock speed
More texture mapping units 32 vs 16 Twice as many texture mapping units
Slightly higher texture rate 16 GTexel/s vs 10 GTexel/s 60% higher texture rate
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Front view of GeForce GT 720M

Reasons to consider the
Nvidia GeForce GT 720M

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Higher clock speed 625 MHz vs 500 MHz 25% higher clock speed
More memory 2,048 MB vs 1,024 MB 2x more memory

Features Key features of the GeForce GTS 250M  vs GT 720M 

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

GeForce GTS 250M
51.2 GB/s
GeForce GT 720M
12.8 GB/s
What you're going to see in the benchmarks is that some workloads tend to favor shader count, others react to the GPU's clock rate, and a third group enjoys memory bandwidth.
GeForce GTS 250M | by Chris-Angelini (Jun, 2013)

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

GeForce GTS 250M
4 GPixel/s
GeForce GT 720M
2.5 GPixel/s
GK104 has done a fantastic job in every field and market segment that NVIDIA has tossed it into with solid performance and even better performance per watt than the competition.
GeForce GTS 250M | by Ryan-Shrout (Jun, 2013)

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

GeForce GTS 250M
16 GTexel/s
GeForce GT 720M
10 GTexel/s
I don’t need to tell you how nice the aesthetics on this mini-ATX machine are, looking like something out of an Iron Man movie, the M8 delivers both performance and beauty.
GeForce GTS 250M | by Syed-Muhammad-Usman-Pirzada (Oct, 2013)

floating point performance How fast the gpu can crunch numbers

GeForce GTS 250M
240 GFLOPS
GeForce GT 720M
240 GFLOPS

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

But given that the Kepler-based GK107 powering a good chunk of the 600M series possesses only a quarter of the shader power of its big brother, we expect another Kepler GPU will fill in the gap.
GeForce GTS 250M | by Dustin-Sklavos (Mar, 2012)

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.
GeForce GTS 250M | by Dustin-Sklavos (Mar, 2012)

Specifications Full list of technical specs

gpu

GeForce GTS 250M  vs
GT 720M 
GPU brand Nvidia Nvidia
GPU name GT215 GF117
Market Laptop Laptop
Clock speed 500 MHz 625 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 96 96
Texture mapping units 32 16
Render output processors 8 8
Pixel rate 4 GPixel/s 2.5 GPixel/s
Texture rate 16 GTexel/s 10 GTexel/s
Floating-point performance 240 GFLOPS 240 GFLOPS

memory

GeForce GTS 250M  vs
GT 720M 
Memory clock speed 800 MHz 800 MHz
Effective memory clock speed 3,200 MHz 1,600 MHz
Memory bus 128 bit 64 bit
Memory 1,024 MB 2,048 MB
Memory type GDDR5 DDR3
Memory bandwidth 51.2 GB/s 12.8 GB/s

noise and power

TDP 28W 33W

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