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Radeon HD 7990 vs Radeon RX 6600 XT

Intro

The Radeon HD 7990 features a GPU clock 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 features 2048 Stream Processors, 128 TAUs, and 32 Raster Operation Units.

Compare those specs to the Radeon RX 6600 XT, which features a core clock frequency of 1968 MHz and a GDDR6 memory frequency of 2000 MHz. It also makes use of a 128-bit memory bus, and uses a 7 nm design. It is comprised of 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

Performance-wise, the Radeon HD 7990 should theoretically be quite a bit better than the Radeon RX 6600 XT overall. (explain)

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

Texel Rate

The Radeon RX 6600 XT is a bit (about 4%) better at anisotropic 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

The Radeon RX 6600 XT is a lot (about 107%) better at full screen anti-aliasing than the Radeon HD 7990, and also will be capable of handling higher screen resolutions without slowing down too much. (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 max amount of information (counted in MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 can be processed in one second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the 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 maximum amount of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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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.

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