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Differences What are the advantages of each

Front view of GeForce GT 620

Reasons to consider the
Nvidia GeForce GT 620

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Much higher clock speed 810 MHz vs 540 MHz 50% higher clock speed
Higher effective memory clock speed 1,796 MHz vs 800 MHz Around 2.2x higher effective memory clock speed
Significantly higher memory clock speed 898 MHz vs 400 MHz Around 2.2x higher memory clock speed
Front view of GeForce 9300 GE

Reasons to consider the
Nvidia GeForce 9300 GE

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GPUBoss is not aware of any important advantages of the GeForce 9300 GE vs the GeForce GT 620.

Benchmarks Real world tests of GeForce GT 620 vs 9300 GE

Passmark Industry standard benchmark for overall graphics card performance

We've seen 3DMark favor Nvidia's graphics cards and Intel's CPUs.
GeForce 9300 GE | by Thomas-Soderstrom (Apr, 2013)

Features Key features of the GeForce GT 620  vs 9300 GE 

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

GeForce GT 620
14.4 GB/s
GeForce 9300 GE
6.4 GB/s
Compared to the original Titan we're talking about anywhere from a 13.8% to a 19.9% increase in performance on compute bound workloads or a 16.7% increase on memory bandwidth bound workloads.
GeForce 9300 GE | by Anand-Lal-Shimpi (Feb, 2014)

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

GeForce GT 620
1.62 GPixel/s
GeForce 9300 GE
2.16 GPixel/s
The following is a list of key performance increases and feature additions.
GeForce 9300 GE | by Charles-Gantt (Aug, 2013)

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

GeForce GT 620
6.48 GTexel/s
GeForce 9300 GE
4.32 GTexel/s
To be fair, this benchmark is less friendly to AMD's Radeon HD 7970 GHz Edition.
GeForce 9300 GE | by Igor-Wallossek (Apr, 2013)

floating point performance How fast the gpu can crunch numbers

GeForce GT 620
155.5 GFLOPS
GeForce 9300 GE
20.8 GFLOPS
The floating point performance is promised at 622 double-precision GFlops.
GeForce 9300 GE | by Douglas-Perry (May, 2012)

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

These are the first drivers to support OpenGL 4.3, which among other things means this is the first GeForce driver set to have support for new features such as OpenGL compute shaders, along with full OpenGL ES 3.0 superset functionality.
GeForce 9300 GE | by Ryan-Smith (Oct, 2012)

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

We should expect the GTX TITAN Black Edition to feature 2880 CUDA cores, 240 TMUs, and 48 ROPS.
GeForce 9300 GE | by Anthony-Garreffa (Feb, 2014)

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