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Differences What are the advantages of each

Front view of GeForce GTX 780M Mac

Reasons to consider the
Nvidia GeForce GTX 780M Mac

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Higher effective memory clock speed 5,000 MHz vs 2,484 MHz More than 2x higher effective memory clock speed
More memory 4,096 MB vs 1,024 MB 4x more memory
Higher clock speed 771 MHz vs 648 MHz Around 20% higher clock speed
Better floating-point performance 2,368.5 GFLOPS vs 708.5 GFLOPS More than 3.2x better floating-point performance
Significantly more shading units 1,536 vs 240 1296 more shading units
Higher texture rate 98.7 GTexel/s vs 51.84 GTexel/s More than 90% higher texture rate
More texture mapping units 128 vs 80 48 more texture mapping units
Lower TDP 122W vs 204W More than 40% lower TDP
Front view of GeForce GTX 285 Mac

Reasons to consider the
Nvidia GeForce GTX 285 Mac

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Wider memory bus 512 bit vs 256 bit 2x wider memory bus

Features Key features of the GeForce GTX 780M Mac  vs 285 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 GTX 780M Mac
24.67 GPixel/s
GeForce GTX 285 Mac
20.74 GPixel/s

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

GeForce GTX 780M Mac
98.7 GTexel/s
GeForce GTX 285 Mac
51.84 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 780M Mac
2,368.5 GFLOPS
GeForce GTX 285 Mac
708.5 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 GTX 780M Mac  vs
285 Mac 
GPU brand Nvidia Nvidia
GPU name GK104 GT200 B3
Market Laptop Desktop
Clock speed 771 MHz 648 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 1,536 240
Texture mapping units 128 80
Render output processors 32 32
Pixel rate 24.67 GPixel/s 20.74 GPixel/s
Texture rate 98.7 GTexel/s 51.84 GTexel/s
Floating-point performance 2,368.5 GFLOPS 708.5 GFLOPS

memory

GeForce GTX 780M Mac  vs
285 Mac 
Memory clock speed 1,250 MHz 1,242 MHz
Effective memory clock speed 5,000 MHz 2,484 MHz
Memory bus 256 bit 512 bit
Memory 4,096 MB 1,024 MB
Memory type GDDR5 GDDR3
Memory bandwidth 160 GB/s 159 GB/s

noise and power

TDP 122W 204W

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