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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 600 MHz More than 2x higher clock speed
Much higher effective memory clock speed 8,000 MHz vs 1,800 MHz Around 4.5x higher effective memory clock speed
Significantly more memory 8,192 MB vs 1,024 MB 8x more memory
Much higher memory bandwidth 256 GB/s vs 28.8 GB/s Around 9x higher memory bandwidth
Significantly better floating-point performance 6,175 GFLOPS vs 576 GFLOPS Around 10.8x better floating-point performance
Significantly higher texture rate 193 GTexel/s vs 14.4 GTexel/s Around 13.5x higher texture rate
Significantly higher pixel rate 42.88 GPixel/s vs 4.8 GPixel/s Around 9x higher pixel rate
Significantly more texture mapping units 144 vs 24 120 more texture mapping units
Significantly more shading units 2,304 vs 480 1824 more shading units
Much higher memory clock speed 2,000 MHz vs 900 MHz Around 2.2x higher memory clock speed
Significantly more compute units 36 vs 6 30 more compute units
Much better PassMark direct compute score 3,923 vs 378 Around 10.5x better PassMark direct compute score
More render output processors 32 vs 8 24 more render output processors
Front view of Radeon HD 6650A

Reasons to consider the
AMD Radeon HD 6650A

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Significantly lower TDP 45W vs 185W 4.1x lower TDP

Benchmarks Real world tests of Radeon RX 580 vs HD 6650A

PassMark Direct Compute Measures performance of general-purpose computing using Microsoft DirectCompute

Features Key features of the Radeon RX 580  vs HD 6650A 

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

Radeon RX 580
256 GB/s
Radeon HD 6650A
28.8 GB/s

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

Radeon RX 580
42.88 GPixel/s
Radeon HD 6650A
4.8 GPixel/s

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

Radeon RX 580
193 GTexel/s
Radeon HD 6650A
14.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon RX 580
6,175 GFLOPS
Radeon HD 6650A
576 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

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