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Radeon HD 7990 vs Radeon RX 6650 XT

Intro

The Radeon HD 7990 comes with clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs along with 128 TAUs and 32 ROPs.

Compare that to the Radeon RX 6650 XT, which uses a 7 nm design. AMD has clocked the core frequency at 2055 MHz. The GDDR6 memory is set to run at a frequency of 2190 MHz on this particular card. It features 2048 SPUs along with 128 TAUs and 64 Rasterization Operator Units.

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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

Theoretically, the Radeon HD 7990 should be a lot faster than the Radeon RX 6650 XT in general. (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 just a bit (more or less 8%) more effective 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

The Radeon RX 6650 XT will be much (about 116%) more effective at anti-aliasing than the Radeon HD 7990, and should be capable of handling higher screen resolutions while still performing well. (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: Bandwidth is the max amount of information (in units of megabytes per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability 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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