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Radeon RX 580 vs Radeon RX 6600 XT

Intro

The Radeon RX 580 features a core clock speed of 1257 MHz and a GDDR5 memory frequency of 2000 MHz. It also makes use of a 256-bit memory bus, and uses a 14 nm design. It features 2304 SPUs, 144 TAUs, and 32 Raster Operation Units.

Compare those specifications to the Radeon RX 6600 XT, which uses a 7 nm design. AMD has set the core speed at 1968 MHz. The GDDR6 memory runs at a frequency of 2000 MHz on this specific model. It features 2048 SPUs along with 128 Texture Address Units and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6600 XT 160 Watts
Radeon RX 580 185 Watts
Difference: 25 Watts (16%)

Memory Bandwidth

Both cards have exactly the same memory bandwidth, so in theory they should have the same performance. (explain)

Texel Rate

The Radeon RX 6600 XT is much (more or less 39%) more effective at anisotropic filtering than the Radeon RX 580. (explain)

Radeon RX 6600 XT 251904 Mtexels/sec
Radeon RX 580 181008 Mtexels/sec
Difference: 70896 (39%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 6600 XT is the winner, by far. (explain)

Radeon RX 6600 XT 125952 Mpixels/sec
Radeon RX 580 40224 Mpixels/sec
Difference: 85728 (213%)

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 6600 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 6600 XT
Manufacturer AMD AMD
Year April 2017 August 2021
Code Name Polaris 20 Navi 23 XT
Memory 8192 MB 8192 MB
Core Speed 1257 MHz 1968 MHz
Memory Speed 8000 MHz 4000 GB/s
Power (Max TDP) 185 watts 160 watts
Bandwidth 262144 MB/sec 262144 MB/sec
Texel Rate 181008 Mtexels/sec 251904 Mtexels/sec
Pixel Rate 40224 Mpixels/sec 125952 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: Bandwidth is the maximum amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon RX 580

Amazon.com

Check prices at:

Radeon RX 6600 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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