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Radeon HD 7990 vs Radeon RX 6950 XT

Intro

The Radeon HD 7990 has clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Compare those specs to the Radeon RX 6950 XT, which comes with a GPU core clock speed of 1925 MHz, and 16384 MB of GDDR6 memory running at 2250 MHz through a 256-bit bus. It also is comprised of 5120 SPUs, 320 Texture Address Units, and 128 Raster Operation Units.

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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 should in theory perform a small 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 should be 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 should be quite a bit (about 305%) better at full screen anti-aliasing than the Radeon HD 7990, and should be capable of handling higher screen resolutions without losing too much performance. (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: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most 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 amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - 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 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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