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Differences What are the advantages of each

Front view of GeForce GTX 650 Ti

Reasons to consider the
Axigon GeForce GTX 650 Ti

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Higher clock speed 1,006 MHz vs 900 MHz More than 10% higher clock speed
Higher effective memory clock speed 5,400 MHz vs 4,104 MHz More than 30% higher effective memory clock speed
Better floating-point performance 1,545 GFLOPS vs 691.2 GFLOPS Around 2.2x better floating-point performance
Higher texture rate 64.4 GTexel/s vs 28.8 GTexel/s Around 2.2x higher texture rate
Higher pixel rate 16.1 GPixel/s vs 7.2 GPixel/s Around 2.2x higher pixel rate
Higher memory clock speed 1,350 MHz vs 1,026 MHz More than 30% higher memory clock speed
More shading units 768 vs 192 576 more shading units
More texture mapping units 64 vs 32 Twice as many texture mapping units
Front view of GeForce GTX 550 Ti

Reasons to consider the
Nvidia GeForce GTX 550 Ti

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More render output processors 24 vs 16 8 more render output processors
Wider memory bus 192 bit vs 128 bit 50% wider memory bus

Features Key features of the GeForce GTX 650 Ti  vs 550 Ti 

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

Unlike the other GTX 650 Ti cards that we reviewed before, this card comes with 2 GB of GDDR5 memory, whereas the other boards only had 1 GB.
GeForce GTX 650 Ti | by techPowerUp! (Oct, 2012)

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

GeForce GTX 650 Ti
16.1 GPixel/s
GeForce GTX 550 Ti
7.2 GPixel/s
It offers fantastic cooling performance and equally low noise levels.
GeForce GTX 650 Ti | by techPowerUp! (Apr, 2013)

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

GeForce GTX 650 Ti
64.4 GTexel/s
GeForce GTX 550 Ti
28.8 GTexel/s
9.1NVIDIA's new GeForce GTX 650 Ti offers much better performance than the normal GTX 650.
GeForce GTX 650 Ti | by techPowerUp! (Oct, 2012)

floating point performance How fast the gpu can crunch numbers

GeForce GTX 650 Ti
1,545 GFLOPS
GeForce GTX 550 Ti
691.2 GFLOPS
Based on a rehashed AnvilNext game engine that uses DirectX 11 and Havok CPU physics, Assassin's Creed III is the most graphics-intensive member of the franchise, depicting North American landscapes in great detail.
GeForce GTX 650 Ti | by techPowerUp! (Apr, 2013)

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

To accomplish this task, the GTX 550 Ti is based on new 40 nm GF116 silicon, which packs 192 shader cores, and a 192-bit GDDR5 interface.
GeForce GTX 550 Ti | by techPowerUp! (Mar, 2011)

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

Reviews Word on the street

GeForce GTX 650 Ti  vs 550 Ti 

9.1
8.8
In this review, we're taking a close look at the ASUS GeForce GTX 650 Ti DirectCU II TOP: a premium factory-overclocked model that combines ASUS's workhorse performance-segment cooler, the 2-slot DirectCU II, with a custom-design PCB.
GeForce GTX 650 Ti

Specifications Full list of technical specs

gpu

GeForce GTX 650 Ti  vs
550 Ti 
GPU brand Nvidia Nvidia
GPU name GK106 GF116
Market Desktop Desktop
Clock speed 1,006 MHz 900 MHz
Is dual GPU No No
Reference card Nvidia GeForce GTX 650 Ti 928 MHz 1 GB None

raw performance

Shading units 768 192
Texture mapping units 64 32
Render output processors 16 24
Pixel rate 16.1 GPixel/s 7.2 GPixel/s
Texture rate 64.4 GTexel/s 28.8 GTexel/s
Floating-point performance 1,545 GFLOPS 691.2 GFLOPS

memory

GeForce GTX 650 Ti  vs
550 Ti 
Memory clock speed 1,350 MHz 1,026 MHz
Effective memory clock speed 5,400 MHz 4,104 MHz
Memory bus 128 bit 192 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 86.4 GB/s 98.5 GB/s

noise and power

TDP 110W 116W

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