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Differences What are the advantages of each

Front view of GeForce GTX 650

Reasons to consider the
Colorful GeForce GTX 650

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Much higher clock speed 1,058 MHz vs 650 MHz Around 65% higher clock speed
Higher effective memory clock speed 5,000 MHz vs 3,400 MHz More than 45% higher effective memory clock speed
Significantly higher memory clock speed 1,250 MHz vs 850 MHz More than 45% higher memory clock speed
Lower TDP 65W vs 150W 2.3x lower TDP
Front view of GeForce GTX 460

Reasons to consider the
Nvidia GeForce GTX 460

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More render output processors 32 vs 16 Twice as many render output processors
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
More texture mapping units 56 vs 32 24 more texture mapping units

Features Key features of the GeForce GTX 650  vs 460 

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

GeForce GTX 650
80 GB/s
GeForce GTX 460
108.8 GB/s
The GeForce GTX 650 Ti Boost doesn't tinker with the streaming multiprocessor count, but utilizes the full 192-bit wide GDDR5 memory interface, GPU Boost with core clock speeds crossing the 1 GHz mark far too often, and a memory bandwidth of 144 GB/s..
GeForce GTX 650 | by techPowerUp! (Mar, 2013)

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

GeForce GTX 650
8.46 GPixel/s
GeForce GTX 460
9.1 GPixel/s
It is clearly targeted at entry-level users who may or may not play games at all.
GeForce GTX 650 | by techPowerUp! (Sep, 2012)

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

GeForce GTX 650
33.9 GTexel/s
GeForce GTX 460
36.4 GTexel/s
It is clearly targeted at entry-level users that may or may not play games.
GeForce GTX 650 | by techPowerUp! (Sep, 2012)

floating point performance How fast the gpu can crunch numbers

GeForce GTX 650
812.5 GFLOPS
GeForce GTX 460
873.6 GFLOPS

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

The GK107 GPU is using a scaled down Kepler architecture design with just 16 ROPs and 384 shaders.
GeForce GTX 650 | by techPowerUp! (Sep, 2012)

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

Reviews Word on the street

GeForce GTX 650  vs 460 

8.6
9.0
If you read our other GeForce GTX 460 reviews today you will have noticed that NVIDIA's reference design cooler is very quiet.
GeForce GTX 460

Specifications Full list of technical specs

gpu

GeForce GTX 650  vs
460 
GPU brand Nvidia Nvidia
GPU name GK107 GF104
Market Desktop Desktop
Clock speed 1,058 MHz 650 MHz
Is dual GPU No No
Reference card Nvidia GeForce GTX 650 1.1 GHz 1 GB None

raw performance

Shading units 384 336
Texture mapping units 32 56
Render output processors 16 32
Pixel rate 8.46 GPixel/s 9.1 GPixel/s
Texture rate 33.9 GTexel/s 36.4 GTexel/s
Floating-point performance 812.5 GFLOPS 873.6 GFLOPS

memory

GeForce GTX 650  vs
460 
Memory clock speed 1,250 MHz 850 MHz
Effective memory clock speed 5,000 MHz 3,400 MHz
Memory bus 128 bit 256 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 80 GB/s 108.8 GB/s

noise and power

TDP 65W 150W

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