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Radeon HD 7970 vs Radeon RX 6600 XT

Intro

The Radeon HD 7970 uses a 28 nm design. AMD has set the core frequency at 925 MHz. The GDDR5 memory runs at a frequency of 1375 MHz on this particular model. It features 2048 SPUs along with 128 TAUs and 32 ROPs.

Compare all of that to the Radeon RX 6600 XT, which features a core clock speed of 1968 MHz and a GDDR6 memory frequency of 2000 MHz. It also makes use of a 128-bit memory bus, and makes use of a 7 nm design. It features 2048 SPUs, 128 TAUs, and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6600 XT 160 Watts
Radeon HD 7970 250 Watts
Difference: 90 Watts (56%)

Memory Bandwidth

Performance-wise, the Radeon HD 7970 should in theory be just a bit superior to the Radeon RX 6600 XT in general. (explain)

Radeon HD 7970 264000 MB/sec
Radeon RX 6600 XT 262144 MB/sec
Difference: 1856 (1%)

Texel Rate

The Radeon RX 6600 XT will be quite a bit (approximately 113%) better at AF than the Radeon HD 7970. (explain)

Radeon RX 6600 XT 251904 Mtexels/sec
Radeon HD 7970 118400 Mtexels/sec
Difference: 133504 (113%)

Pixel Rate

The Radeon RX 6600 XT will be a lot (about 326%) more effective at FSAA than the Radeon HD 7970, and also capable of handling higher resolutions more effectively. (explain)

Radeon RX 6600 XT 125952 Mpixels/sec
Radeon HD 7970 29600 Mpixels/sec
Difference: 96352 (326%)

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 7970

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 HD 7970 Radeon RX 6600 XT
Manufacturer AMD AMD
Year January 2012 August 2021
Code Name Tahiti XT Navi 23 XT
Memory 3072 MB 8192 MB
Core Speed 925 MHz 1968 MHz
Memory Speed 5500 MHz 4000 GB/s
Power (Max TDP) 250 watts 160 watts
Bandwidth 264000 MB/sec 262144 MB/sec
Texel Rate 118400 Mtexels/sec 251904 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 125952 Mpixels/sec
Unified Shaders 2048 2048
Texture Mapping Units 128 128
Render Output Units 32 64
Bus Type GDDR5 GDDR6
Bus Width 384-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 4.2 OpenGL 4.6

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units 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 also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 7970

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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