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Differences What are the advantages of each

Front view of GeForce GTX 780

Reasons to consider the
Nvidia GeForce GTX 780

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Significantly higher memory bandwidth 288.4 GB/s vs 192.3 GB/s Around 50% higher memory bandwidth
More memory 3,072 MB vs 2,048 MB 50% more memory
Better floating-point performance 3,977 GFLOPS vs 3,090.4 GFLOPS Around 30% better floating-point performance
Significantly more texture mapping units 192 vs 128 64 more texture mapping units
Higher texture rate 165.7 GTexel/s vs 128.8 GTexel/s Around 30% higher texture rate
More shading units 2,304 vs 1,536 768 more shading units
More render output processors 48 vs 32 16 more render output processors
Higher pixel rate 41.4 GPixel/s vs 32.2 GPixel/s Around 30% higher pixel rate
Wider memory bus 384 bit vs 256 bit 50% wider memory bus
Front view of GeForce GTX 680 Mac

Reasons to consider the
EVGA GeForce GTX 680 Mac

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Higher clock speed 1,006 MHz vs 863 MHz More than 15% higher clock speed
Higher turbo clock speed 1,058 MHz vs 902 MHz More than 15% higher turbo clock speed
Lower TDP 195W vs 250W More than 20% lower TDP

Features Key features of the GeForce GTX 780  vs 680 Mac 

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

GeForce GTX 780
288.4 GB/s
GeForce GTX 680 Mac
192.3 GB/s

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

GeForce GTX 780
41.4 GPixel/s
GeForce GTX 680 Mac
32.2 GPixel/s

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

GeForce GTX 780
165.7 GTexel/s
GeForce GTX 680 Mac
128.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 780
3,977 GFLOPS
GeForce GTX 680 Mac
3,090.4 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 780  vs
680 Mac 
GPU brand Nvidia Nvidia
GPU name GK110 GK104
Market Desktop Desktop
Clock speed 863 MHz 1,006 MHz
Turbo clock speed 902 MHz 1,058 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GTX 680 Mac Edition 1 GHz 2 GB

raw performance

Shading units 2,304 1,536
Texture mapping units 192 128
Render output processors 48 32
SMX units 13 8
Pixel rate 41.4 GPixel/s 32.2 GPixel/s
Texture rate 165.7 GTexel/s 128.8 GTexel/s
Floating-point performance 3,977 GFLOPS 3,090.4 GFLOPS

memory

GeForce GTX 780  vs
680 Mac 
Memory clock speed 1,502 MHz 1,502 MHz
Effective memory clock speed 6,008 MHz 6,008 MHz
Memory bus 384 bit 256 bit
Memory 3,072 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 288.4 GB/s 192.3 GB/s

noise and power

TDP 250W 195W

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