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Radeon HD 7990 vs Radeon RX 6600 XT

Intro

The Radeon HD 7990 has a GPU core speed of 950 MHz, and the 3072 MB of GDDR5 memory is set to run at 1500 MHz through a 384-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Compare all of that to the Radeon RX 6600 XT, which comes with a GPU core clock speed of 1968 MHz, and 8192 MB of GDDR6 memory set to run at 2000 MHz through a 128-bit bus. It also features 2048 SPUs, 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 HD 7990 375 Watts
Difference: 215 Watts (134%)

Memory Bandwidth

The Radeon HD 7990, in theory, should perform much faster than the Radeon RX 6600 XT in general. (explain)

Radeon HD 7990 576000 MB/sec
Radeon RX 6600 XT 262144 MB/sec
Difference: 313856 (120%)

Texel Rate

The Radeon RX 6600 XT should be a bit (approximately 4%) better at texture filtering than the Radeon HD 7990. (explain)

Radeon RX 6600 XT 251904 Mtexels/sec
Radeon HD 7990 243200 Mtexels/sec
Difference: 8704 (4%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon RX 6600 XT is the winner, by a large margin. (explain)

Radeon RX 6600 XT 125952 Mpixels/sec
Radeon HD 7990 60800 Mpixels/sec
Difference: 65152 (107%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 7990

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.

Specifications

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Model Radeon HD 7990 Radeon RX 6600 XT
Manufacturer AMD AMD
Year April 2013 August 2021
Code Name Malta Navi 23 XT
Memory 3072 MB (x2) 8192 MB
Core Speed 950 MHz (x2) 1968 MHz
Memory Speed 6000 MHz (x2) 4000 GB/s
Power (Max TDP) 375 watts 160 watts
Bandwidth 576000 MB/sec 262144 MB/sec
Texel Rate 243200 Mtexels/sec 251904 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 125952 Mpixels/sec
Unified Shaders 2048 (x2) 2048
Texture Mapping Units 128 (x2) 128
Render Output Units 32 (x2) 64
Bus Type GDDR5 GDDR6
Bus Width 384-bit (x2) 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 largest amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 7990

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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