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Differences What are the advantages of each

Front view of Radeon RX 580

Reasons to consider the
AMD Radeon RX 580

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Much higher clock speed 1,257 MHz vs 550 MHz More than 2.2x higher clock speed
Much higher effective memory clock speed 8,000 MHz vs 1,600 MHz 5x higher effective memory clock speed
Significantly more memory 8,192 MB vs 512 MB 16x more memory
Much higher memory bandwidth 256 GB/s vs 25.6 GB/s 10x higher memory bandwidth
Much better floating-point performance 6,175 GFLOPS vs 89.6 GFLOPS Around 69x better floating-point performance
Much higher texture rate 193 GTexel/s vs 8.8 GTexel/s Around 22x higher texture rate
Significantly higher pixel rate 42.88 GPixel/s vs 4.4 GPixel/s Around 9.8x higher pixel rate
Many more shading units 2,304 vs 32 2272 more shading units
Significantly more texture mapping units 144 vs 16 128 more texture mapping units
Much higher memory clock speed 2,000 MHz vs 800 MHz 2.5x higher memory clock speed
More render output processors 32 vs 8 24 more render output processors
Front view of GeForce GT 120 Mac

Reasons to consider the
Nvidia GeForce GT 120 Mac

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Significantly lower TDP 50W vs 185W 3.7x lower TDP

Features Key features of the Radeon RX 580  vs GeForce GT 120 Mac 

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

Radeon RX 580
256 GB/s
GeForce GT 120 Mac
25.6 GB/s

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

Radeon RX 580
42.88 GPixel/s
GeForce GT 120 Mac
4.4 GPixel/s

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

Radeon RX 580
193 GTexel/s
GeForce GT 120 Mac
8.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon RX 580
6,175 GFLOPS
GeForce GT 120 Mac
89.6 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

Radeon RX 580  vs
GeForce GT 120 Mac 
GPU brand AMD Nvidia
GPU name Polaris 20 G96 C1
Clock speed 1,257 MHz 550 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 2,304 32
Texture mapping units 144 16
Render output processors 32 8
Pixel rate 42.88 GPixel/s 4.4 GPixel/s
Texture rate 193 GTexel/s 8.8 GTexel/s
Floating-point performance 6,175 GFLOPS 89.6 GFLOPS

memory

Radeon RX 580  vs
GeForce GT 120 Mac 
Memory clock speed 2,000 MHz 800 MHz
Effective memory clock speed 8,000 MHz 1,600 MHz
Memory bus 256 bit 128 bit
Memory 8,192 MB 512 MB
Memory type GDDR5 GDDR3
Memory bandwidth 256 GB/s 25.6 GB/s

noise and power

TDP 185W 50W

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