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Radeon RX 580 vs Radeon RX 6650 XT

Intro

The Radeon RX 580 features a GPU core speed of 1257 MHz, and the 8192 MB of GDDR5 memory is set to run at 2000 MHz through a 256-bit bus. It also features 2304 SPUs, 144 TAUs, and 32 Raster Operation Units.

Compare those specs to the Radeon RX 6650 XT, which has a core clock speed of 2055 MHz and a GDDR6 memory frequency of 2190 MHz. It also uses a 128-bit bus, and makes use of a 7 nm design. It features 2048 SPUs, 128 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6650 XT 176 Watts
Radeon RX 580 185 Watts
Difference: 9 Watts (5%)

Memory Bandwidth

Theoretically, the Radeon RX 6650 XT should perform a small bit faster than the Radeon RX 580 overall. (explain)

Radeon RX 6650 XT 287072 MB/sec
Radeon RX 580 262144 MB/sec
Difference: 24928 (10%)

Texel Rate

The Radeon RX 6650 XT should be quite a bit (approximately 45%) more effective at texture filtering than the Radeon RX 580. (explain)

Radeon RX 6650 XT 263040 Mtexels/sec
Radeon RX 580 181008 Mtexels/sec
Difference: 82032 (45%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 6650 XT is superior to the Radeon RX 580, by a large margin. (explain)

Radeon RX 6650 XT 131520 Mpixels/sec
Radeon RX 580 40224 Mpixels/sec
Difference: 91296 (227%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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Radeon RX 580

Amazon.com

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Radeon RX 6650 XT

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon RX 580 Radeon RX 6650 XT
Manufacturer AMD AMD
Year April 2017 May 2022
Code Name Polaris 20 Navi 23
Memory 8192 MB 8192 MB
Core Speed 1257 MHz 2055 MHz
Memory Speed 8000 MHz 4380 GB/s
Power (Max TDP) 185 watts 176 watts
Bandwidth 262144 MB/sec 287072 MB/sec
Texel Rate 181008 Mtexels/sec 263040 Mtexels/sec
Pixel Rate 40224 Mpixels/sec 131520 Mpixels/sec
Unified Shaders 2304 2048
Texture Mapping Units 144 128
Render Output Units 32 64
Bus Type GDDR5 GDDR6
Bus Width 256-bit 128-bit
Fab Process 14 nm 7 nm
Transistors 5700 million 11060 million
Bus PCIe 3.0 x16 PCIe 4.0 x16
DirectX Version DirectX 12.0 DirectX 12
OpenGL Version OpenGL 4.5 OpenGL 4.6

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon RX 580

Amazon.com

Check prices at:

Radeon RX 6650 XT

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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