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Radeon HD 7990 vs Radeon RX 6650 XT

Intro

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

Compare those specifications to the Radeon RX 6650 XT, which uses a 7 nm design. AMD has clocked the core frequency at 2055 MHz. The GDDR6 RAM is set to run at a frequency of 2190 MHz on this model. It features 2048 SPUs along with 128 Texture Address Units and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6650 XT 176 Watts
Radeon HD 7990 375 Watts
Difference: 199 Watts (113%)

Memory Bandwidth

In theory, the Radeon HD 7990 should be 101% quicker than the Radeon RX 6650 XT in general, because of its higher bandwidth. (explain)

Radeon HD 7990 576000 MB/sec
Radeon RX 6650 XT 287072 MB/sec
Difference: 288928 (101%)

Texel Rate

The Radeon RX 6650 XT will be a small bit (about 8%) better at texture filtering than the Radeon HD 7990. (explain)

Radeon RX 6650 XT 263040 Mtexels/sec
Radeon HD 7990 243200 Mtexels/sec
Difference: 19840 (8%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon RX 6650 XT is the winner, by a large margin. (explain)

Radeon RX 6650 XT 131520 Mpixels/sec
Radeon HD 7990 60800 Mpixels/sec
Difference: 70720 (116%)

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 6650 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 6650 XT
Manufacturer AMD AMD
Year April 2013 May 2022
Code Name Malta Navi 23
Memory 3072 MB (x2) 8192 MB
Core Speed 950 MHz (x2) 2055 MHz
Memory Speed 6000 MHz (x2) 4380 GB/s
Power (Max TDP) 375 watts 176 watts
Bandwidth 576000 MB/sec 287072 MB/sec
Texel Rate 243200 Mtexels/sec 263040 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 131520 Mpixels/sec
Unified Shaders 2048 (x2) 2048
Texture Mapping Units 128 (x2) 128
Render Output Units 32 (x2) 64
Bus Type GDDR5 GDDR6
Bus Width 384-bit (x2) 128-bit
Fab Process 28 nm 7 nm
Transistors 4313 million 11060 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 data (counted in megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory 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 6650 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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