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Radeon HD 7870 XT vs Radeon RX 6600

Intro

The Radeon HD 7870 XT comes with a GPU clock speed of 925 MHz, and the 2048 MB of GDDR5 memory is set to run at 1500 MHz through a 256-bit bus. It also is comprised of 1536 SPUs, 96 TAUs, and 32 ROPs.

Compare all that to the Radeon RX 6600, which makes use of a 7 nm design. AMD has clocked the core frequency at 1626 MHz. The GDDR6 RAM works at a speed of 1750 MHz on this specific model. It features 1792 SPUs as well as 112 Texture Address Units and 64 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6600 132 Watts
Radeon HD 7870 XT 185 Watts
Difference: 53 Watts (40%)

Memory Bandwidth

In theory, the Radeon RX 6600 should be a bit faster than the Radeon HD 7870 XT in general. (explain)

Radeon RX 6600 229376 MB/sec
Radeon HD 7870 XT 192000 MB/sec
Difference: 37376 (19%)

Texel Rate

The Radeon RX 6600 should be a lot (approximately 105%) faster with regards to anisotropic filtering than the Radeon HD 7870 XT. (explain)

Radeon RX 6600 182112 Mtexels/sec
Radeon HD 7870 XT 88800 Mtexels/sec
Difference: 93312 (105%)

Pixel Rate

The Radeon RX 6600 will be much (approximately 252%) better at AA than the Radeon HD 7870 XT, and also will be able to handle higher resolutions without slowing down too much. (explain)

Radeon RX 6600 104064 Mpixels/sec
Radeon HD 7870 XT 29600 Mpixels/sec
Difference: 74464 (252%)

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 HD 7870 XT

Amazon.com

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Radeon RX 6600

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 HD 7870 XT Radeon RX 6600
Manufacturer AMD AMD
Year November 2012 October 2021
Code Name Tahiti LE Navi 23
Memory 2048 MB 8192 MB
Core Speed 925 MHz 1626 MHz
Memory Speed 6000 MHz 3500 GB/s
Power (Max TDP) 185 watts 132 watts
Bandwidth 192000 MB/sec 229376 MB/sec
Texel Rate 88800 Mtexels/sec 182112 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 104064 Mpixels/sec
Unified Shaders 1536 1792
Texture Mapping Units 96 112
Render Output Units 32 64
Bus Type GDDR5 GDDR6
Bus Width 256-bit 128-bit
Fab Process 28 nm 7 nm
Transistors 4313 million 11060 million
Bus PCIe 3.0 x16 PCIe 4.0 x16
DirectX Version DirectX 11.1 DirectX 12
OpenGL Version OpenGL 4.3 OpenGL 4.6

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units of the card by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 7870 XT

Amazon.com

Check prices at:

Radeon RX 6600

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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