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Differences What are the advantages of each

Front view of GeForce GT 650M Mac

Reasons to consider the
Nvidia GeForce GT 650M Mac

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Significantly higher clock speed 900 MHz vs 500 MHz 80% higher clock speed
Significantly higher effective memory clock speed 5,016 MHz vs 1,580 MHz Around 3.2x higher effective memory clock speed
Higher memory bandwidth 80.3 GB/s vs 25.28 GB/s Around 3.2x higher memory bandwidth
Better floating-point performance 691.2 GFLOPS vs 105.6 GFLOPS More than 6.5x better floating-point performance
Significantly higher memory clock speed 1,254 MHz vs 790 MHz Around 60% higher memory clock speed
Higher texture rate 28.8 GTexel/s vs 8 GTexel/s More than 3.5x higher texture rate
More shading units 384 vs 48 336 more shading units
More render output processors 16 vs 8 Twice as many render output processors
More texture mapping units 32 vs 16 Twice as many texture mapping units
Front view of GeForce GT 330M Mac

Reasons to consider the
Nvidia GeForce GT 330M Mac

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Lower TDP 23W vs 45W Around 50% lower TDP

Features Key features of the GeForce GT 650M Mac  vs 330M Mac 

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

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

GeForce GT 650M Mac
7.2 GPixel/s
GeForce GT 330M Mac
4 GPixel/s

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

GeForce GT 650M Mac
28.8 GTexel/s
GeForce GT 330M Mac
8 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 650M Mac
691.2 GFLOPS
GeForce GT 330M Mac
105.6 GFLOPS

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

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

Specifications Full list of technical specs

gpu

GeForce GT 650M Mac  vs
330M Mac 
GPU brand Nvidia Nvidia
GPU name GK107 GT216
Market Laptop Laptop
Clock speed 900 MHz 500 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 384 48
Texture mapping units 32 16
Render output processors 16 8
Pixel rate 7.2 GPixel/s 4 GPixel/s
Texture rate 28.8 GTexel/s 8 GTexel/s
Floating-point performance 691.2 GFLOPS 105.6 GFLOPS

memory

GeForce GT 650M Mac  vs
330M Mac 
Memory clock speed 1,254 MHz 790 MHz
Effective memory clock speed 5,016 MHz 1,580 MHz
Memory bus 128 bit 128 bit
Memory 512 MB 512 MB
Memory type GDDR5 GDDR3
Memory bandwidth 80.3 GB/s 25.28 GB/s

noise and power

TDP 45W 23W

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