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Radeon HD 7990 vs Radeon RX 6950 XT

Intro

The Radeon HD 7990 uses a 28 nm design. AMD has set the core frequency at 950 MHz. The GDDR5 memory is set to run at a frequency of 1500 MHz on this particular card. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Compare all that to the Radeon RX 6950 XT, which comes with core clock speeds of 1925 MHz on the GPU, and 2250 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 6950 XT 335 Watts
Radeon HD 7990 375 Watts
Difference: 40 Watts (12%)

Memory Bandwidth

The Radeon RX 6950 XT, in theory, should perform just a bit faster than the Radeon HD 7990 in general. (explain)

Radeon RX 6950 XT 589824 MB/sec
Radeon HD 7990 576000 MB/sec
Difference: 13824 (2%)

Texel Rate

The Radeon RX 6950 XT is much (approximately 153%) faster with regards to anisotropic filtering than the Radeon HD 7990. (explain)

Radeon RX 6950 XT 616000 Mtexels/sec
Radeon HD 7990 243200 Mtexels/sec
Difference: 372800 (153%)

Pixel Rate

The Radeon RX 6950 XT will be quite a bit (about 305%) faster with regards to FSAA than the Radeon HD 7990, and also will be able to handle higher screen resolutions while still performing well. (explain)

Radeon RX 6950 XT 246400 Mpixels/sec
Radeon HD 7990 60800 Mpixels/sec
Difference: 185600 (305%)

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 6950 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 6950 XT
Manufacturer AMD AMD
Year April 2013 May 2022
Code Name Malta Navi 21
Memory 3072 MB (x2) 16384 MB
Core Speed 950 MHz (x2) 1925 MHz
Memory Speed 6000 MHz (x2) 4500 GB/s
Power (Max TDP) 375 watts 335 watts
Bandwidth 576000 MB/sec 589824 MB/sec
Texel Rate 243200 Mtexels/sec 616000 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 246400 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 max amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 7990

Amazon.com

Check prices at:

Radeon RX 6950 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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