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Radeon HD 7870 XT vs Radeon RX 6600

Intro

The Radeon HD 7870 XT features a clock frequency of 925 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It features 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon RX 6600, which features core clock speeds of 1626 MHz on the GPU, and 1750 MHz on the 8192 MB of GDDR6 RAM. It features 1792 SPUs as well as 112 Texture Address Units and 64 ROPs.

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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

Performance-wise, the Radeon RX 6600 should in theory be just a bit superior to 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 is much (approximately 105%) better at texture 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

If using a high resolution is important to you, then the Radeon RX 6600 is superior to the Radeon HD 7870 XT, and very much so. (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: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's 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 are applied per second. This number is worked out by multiplying the total texture units by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max 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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