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Differences What are the advantages of each

Front view of GeForce GT 630 PCIe x8

Reasons to consider the
Nvidia GeForce GT 630 PCIe x8

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More memory 2,048 MB vs 512 MB 4x more memory
Higher clock speed 902 MHz vs 810 MHz More than 10% higher clock speed
Slightly better floating-point performance 692.7 GFLOPS vs 155.5 GFLOPS Around 4.5x better floating-point performance
Slightly higher pixel rate 7.22 GPixel/s vs 1.62 GPixel/s Around 4.5x higher pixel rate
More shading units 384 vs 48 336 more shading units
Front view of GeForce GT 620

Reasons to consider the
Nvidia GeForce GT 620

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GPUBoss is not aware of any important advantages of the 620 OEM vs the 630 PCIe x8 GeForce GT 630 Rev. 2 PCIe x8.

Features Key features of the GeForce GT 630 PCIe x8  vs 620 

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

GeForce GT 630 PCIe x8
7.22 GPixel/s
GeForce GT 620
1.62 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

GeForce GT 630 PCIe x8
14.4 GTexel/s
GeForce GT 620
6.48 GTexel/s
More exciting from AMD's perspective is that it can deliver performance similar to the 3870K's 400-core GPU with the 256-core GPU in the A8-5600K.
GeForce GT 630 PCIe x8 | by Anand-Lal-Shimpi (Sep, 2012)

floating point performance How fast the gpu can crunch numbers

GeForce GT 630 PCIe x8
692.7 GFLOPS
GeForce GT 620
155.5 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

GeForce GT 630 PCIe x8  vs
620 
GPU brand Nvidia Nvidia
GPU name GK208 GF119
Market Desktop Desktop
Clock speed 902 MHz 810 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 384 48
Texture mapping units 16 8
Render output processors 8 4
Pixel rate 7.22 GPixel/s 1.62 GPixel/s
Texture rate 14.4 GTexel/s 6.48 GTexel/s
Floating-point performance 692.7 GFLOPS 155.5 GFLOPS

memory

GeForce GT 630 PCIe x8  vs
620 
Memory clock speed 900 MHz 898 MHz
Effective memory clock speed 1,800 MHz 1,796 MHz
Memory bus 64 bit 64 bit
Memory 2,048 MB 512 MB
Memory type DDR3 DDR3
Memory bandwidth 14.4 GB/s 14.4 GB/s

noise and power

TDP 25W 30W

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