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Differences What are the advantages of each

Front view of Radeon RX 550

Reasons to consider the
AMD Radeon RX 550

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Much higher effective memory clock speed 7,000 MHz vs 1,600 MHz Around 4.5x higher effective memory clock speed
Significantly higher clock speed 1,100 MHz vs 720 MHz Around 55% higher clock speed
Higher memory bandwidth 112 GB/s vs 38.4 GB/s Around 3x higher memory bandwidth
Much higher memory clock speed 1,750 MHz vs 800 MHz Around 2.2x higher memory clock speed
Higher pixel rate 18.93 GPixel/s vs 4.32 GPixel/s Around 4.5x higher pixel rate
Slightly better floating-point performance 1,211 GFLOPS vs 414.7 GFLOPS Around 3x better floating-point performance
More shading units 512 vs 144 368 more shading units
Lower TDP 50W vs 75W Around 35% lower TDP
Front view of GeForce GT 640 Rebrand

Reasons to consider the
Nvidia GeForce GT 640 Rebrand

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More render output processors 24 vs 16 8 more render output processors

Features Key features of the Radeon RX 550  vs GeForce GT 640 Rebrand 

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

Radeon RX 550
18.93 GPixel/s
GeForce GT 640 Rebrand
4.32 GPixel/s

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

Radeon RX 550
37.86 GTexel/s
GeForce GT 640 Rebrand
17.28 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon RX 550
1,211 GFLOPS
GeForce GT 640 Rebrand
414.7 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 550  vs
GeForce GT 640 Rebrand 
GPU brand AMD Nvidia
GPU name Lexa GF116
Clock speed 1,100 MHz 720 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 512 144
Texture mapping units 32 24
Render output processors 16 24
Pixel rate 18.93 GPixel/s 4.32 GPixel/s
Texture rate 37.86 GTexel/s 17.28 GTexel/s
Floating-point performance 1,211 GFLOPS 414.7 GFLOPS

memory

Radeon RX 550  vs
GeForce GT 640 Rebrand 
Memory clock speed 1,750 MHz 800 MHz
Effective memory clock speed 7,000 MHz 1,600 MHz
Memory bus 128 bit 192 bit
Memory 2,048 MB 1,536 MB
Memory type GDDR5 DDR3
Memory bandwidth 112 GB/s 38.4 GB/s

noise and power

TDP 50W 75W

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