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Radeon HD 7990 vs Radeon RX 6800 XT

Intro

The Radeon HD 7990 makes use of a 28 nm design. AMD has set the core speed at 950 MHz. The GDDR5 memory works at a speed of 1500 MHz on this card. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Compare all of that to the Radeon RX 6800 XT, which comes with a core clock speed of 1825 MHz and a GDDR6 memory speed of 2000 MHz. It also makes use of a 256-bit bus, and uses a 7 nm design. It is comprised of 4608 SPUs, 288 Texture Address Units, and 128 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6800 XT 300 Watts
Radeon HD 7990 375 Watts
Difference: 75 Watts (25%)

Memory Bandwidth

In theory, the Radeon HD 7990 should be 10% quicker than the Radeon RX 6800 XT in general, due to its higher bandwidth. (explain)

Radeon HD 7990 576000 MB/sec
Radeon RX 6800 XT 524288 MB/sec
Difference: 51712 (10%)

Texel Rate

The Radeon RX 6800 XT is quite a bit (more or less 116%) faster with regards to texture filtering than the Radeon HD 7990. (explain)

Radeon RX 6800 XT 525600 Mtexels/sec
Radeon HD 7990 243200 Mtexels/sec
Difference: 282400 (116%)

Pixel Rate

The Radeon RX 6800 XT should be a lot (more or less 284%) more effective at FSAA than the Radeon HD 7990, and will be able to handle higher resolutions while still performing well. (explain)

Radeon RX 6800 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 6800 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 6800 XT
Manufacturer AMD AMD
Year April 2013 November 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 525600 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 233600 Mpixels/sec
Unified Shaders 2048 (x2) 4608
Texture Mapping Units 128 (x2) 288
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: Bandwidth is the maximum amount of data (counted in MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the card will be at handling 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 the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 7990

Amazon.com

Check prices at:

Radeon RX 6800 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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