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Radeon HD 7970 vs Radeon RX 6650 XT

Intro

The Radeon HD 7970 features a core clock frequency of 925 MHz and a GDDR5 memory speed of 1375 MHz. It also features a 384-bit bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 ROPs.

Compare those specifications to the Radeon RX 6650 XT, which has a core clock frequency of 2055 MHz and a GDDR6 memory frequency of 2190 MHz. It also uses 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 6650 XT 176 Watts
Radeon HD 7970 250 Watts
Difference: 74 Watts (42%)

Memory Bandwidth

Performance-wise, the Radeon RX 6650 XT should in theory be a little bit superior to the Radeon HD 7970 overall. (explain)

Radeon RX 6650 XT 287072 MB/sec
Radeon HD 7970 264000 MB/sec
Difference: 23072 (9%)

Texel Rate

The Radeon RX 6650 XT should be a lot (about 122%) more effective at AF than the Radeon HD 7970. (explain)

Radeon RX 6650 XT 263040 Mtexels/sec
Radeon HD 7970 118400 Mtexels/sec
Difference: 144640 (122%)

Pixel Rate

The Radeon RX 6650 XT should be quite a bit (approximately 344%) more effective at full screen anti-aliasing than the Radeon HD 7970, and also will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon RX 6650 XT 131520 Mpixels/sec
Radeon HD 7970 29600 Mpixels/sec
Difference: 101920 (344%)

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 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 HD 7970 Radeon RX 6650 XT
Manufacturer AMD AMD
Year January 2012 May 2022
Code Name Tahiti XT Navi 23
Memory 3072 MB 8192 MB
Core Speed 925 MHz 2055 MHz
Memory Speed 5500 MHz 4380 GB/s
Power (Max TDP) 250 watts 176 watts
Bandwidth 264000 MB/sec 287072 MB/sec
Texel Rate 118400 Mtexels/sec 263040 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 131520 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: Memory bandwidth is the max amount of information (counted in MB per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the bus 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 higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. 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 fill rate is also dependant on many other factors, especially 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 HD 7970

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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