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Radeon HD 7990 vs Radeon RX 6900 XT

Intro

The Radeon HD 7990 comes with a core clock frequency of 950 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 384-bit bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Compare those specs to the Radeon RX 6900 XT, which has core speeds of 1825 MHz on the GPU, and 2000 MHz on the 16384 MB of GDDR6 RAM. It features 5120 SPUs as well as 320 TAUs and 128 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6900 XT 300 Watts
Radeon HD 7990 375 Watts
Difference: 75 Watts (25%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should in theory be a small bit better than the Radeon RX 6900 XT in general. (explain)

Radeon HD 7990 576000 MB/sec
Radeon RX 6900 XT 524288 MB/sec
Difference: 51712 (10%)

Texel Rate

The Radeon RX 6900 XT should be quite a bit (about 140%) more effective at anisotropic filtering than the Radeon HD 7990. (explain)

Radeon RX 6900 XT 584000 Mtexels/sec
Radeon HD 7990 243200 Mtexels/sec
Difference: 340800 (140%)

Pixel Rate

The Radeon RX 6900 XT should be a lot (about 284%) better at AA than the Radeon HD 7990, and also should be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon RX 6900 XT 233600 Mpixels/sec
Radeon HD 7990 60800 Mpixels/sec
Difference: 172800 (284%)

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 6900 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 6900 XT
Manufacturer AMD AMD
Year April 2013 2020
Code Name Malta Navi 21
Memory 3072 MB (x2) 16384 MB
Core Speed 950 MHz (x2) 1825 MHz
Memory Speed 6000 MHz (x2) 4000 GB/s
Power (Max TDP) 375 watts 300 watts
Bandwidth 576000 MB/sec 524288 MB/sec
Texel Rate 243200 Mtexels/sec 584000 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 233600 Mpixels/sec
Unified Shaders 2048 (x2) 5120
Texture Mapping Units 128 (x2) 320
Render Output Units 32 (x2) 128
Bus Type GDDR5 GDDR6
Bus Width 384-bit (x2) 256-bit
Fab Process 28 nm 7 nm
Transistors 4313 million 26800 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 largest amount of information (counted in MB per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 7990

Amazon.com

Check prices at:

Radeon RX 6900 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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