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Differences What are the advantages of each

Front view of Radeon HD 8750

Reasons to consider the
AMD Radeon HD 8750

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Higher clock speed 900 MHz vs 800 MHz Around 15% higher clock speed
Higher memory bandwidth 108 GB/s vs 32 GB/s Around 3.5x higher memory bandwidth
Better floating-point performance 1,382 GFLOPS vs 307.2 GFLOPS Around 4.5x better floating-point performance
Higher effective memory clock speed 4,500 MHz vs 3,600 MHz 25% higher effective memory clock speed
Higher pixel rate 14.4 GPixel/s vs 3.2 GPixel/s Around 4.5x higher pixel rate
Higher texture rate 36 GTexel/s vs 12.8 GTexel/s More than 2.8x higher texture rate
More shading units 768 vs 96 672 more shading units
More render output processors 16 vs 4 12 more render output processors
Higher memory clock speed 1,125 MHz vs 900 MHz 25% higher memory clock speed
More texture mapping units 40 vs 16 24 more texture mapping units
Wider memory bus 192 bit vs 128 bit 50% wider memory bus
Front view of GeForce GT 630M

Reasons to consider the
Nvidia GeForce GT 630M

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Lower TDP 33W vs 95W 2.9x lower TDP

Features Key features of the Radeon HD 8750  vs GeForce GT 630M 

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

Radeon HD 8750
108 GB/s
GeForce GT 630M
32 GB/s
In any case you’re still looking at significantly less memory bandwidth the GTX 560 is typically paired with.
GeForce GT 630M | by Ryan-Smith (Apr, 2012)

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

Radeon HD 8750
14.4 GPixel/s
GeForce GT 630M
3.2 GPixel/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 GT 630M | by Syed-Muhammad-Usman-Pirzada (Oct, 2013)

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

Radeon HD 8750
36 GTexel/s
GeForce GT 630M
12.8 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 630M | by hassan-mujtaba (Jun, 2013)

floating point performance How fast the gpu can crunch numbers

Radeon HD 8750
1,382 GFLOPS
GeForce GT 630M
307.2 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 GT 630M | 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 GT 630M | by Dustin-Sklavos (Mar, 2012)

Specifications Full list of technical specs

gpu

Radeon HD 8750  vs
GeForce GT 630M 
GPU brand AMD Nvidia
GPU name Bonaire PRO GF117
Market Desktop Laptop
Clock speed 900 MHz 800 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 768 96
Texture mapping units 40 16
Render output processors 16 4
Pixel rate 14.4 GPixel/s 3.2 GPixel/s
Texture rate 36 GTexel/s 12.8 GTexel/s
Floating-point performance 1,382 GFLOPS 307.2 GFLOPS

memory

Radeon HD 8750  vs
GeForce GT 630M 
Memory clock speed 1,125 MHz 900 MHz
Effective memory clock speed 4,500 MHz 3,600 MHz
Memory bus 192 bit 128 bit
Memory 2,048 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 108 GB/s 32 GB/s

noise and power

TDP 95W 33W

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