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Radeon HD 7990 vs Radeon RX 6800

Intro

The Radeon HD 7990 has core speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

Compare those specs to the Radeon RX 6800, which has a GPU core clock speed of 1700 MHz, and 16384 MB of GDDR6 RAM running at 2000 MHz through a 256-bit bus. It also features 3840 SPUs, 240 Texture Address Units, and 96 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6800 250 Watts
Radeon HD 7990 375 Watts
Difference: 125 Watts (50%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should theoretically be a small bit better than the Radeon RX 6800 in general. (explain)

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

Texel Rate

The Radeon RX 6800 is much (about 68%) faster with regards to anisotropic filtering than the Radeon HD 7990. (explain)

Radeon RX 6800 408000 Mtexels/sec
Radeon HD 7990 243200 Mtexels/sec
Difference: 164800 (68%)

Pixel Rate

The Radeon RX 6800 will be a lot (more or less 168%) faster with regards to FSAA than the Radeon HD 7990, and also will be able to handle higher resolutions more effectively. (explain)

Radeon RX 6800 163200 Mpixels/sec
Radeon HD 7990 60800 Mpixels/sec
Difference: 102400 (168%)

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

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
Manufacturer AMD AMD
Year April 2013 November 2020
Code Name Malta Navi 21
Memory 3072 MB (x2) 16384 MB
Core Speed 950 MHz (x2) 1700 MHz
Memory Speed 6000 MHz (x2) 4000 GB/s
Power (Max TDP) 375 watts 250 watts
Bandwidth 576000 MB/sec 524288 MB/sec
Texel Rate 243200 Mtexels/sec 408000 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 163200 Mpixels/sec
Unified Shaders 2048 (x2) 3840
Texture Mapping Units 128 (x2) 240
Render Output Units 32 (x2) 96
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 largest amount of data (measured in megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 7990

Amazon.com

Check prices at:

Radeon RX 6800

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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