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Radeon HD 7990 vs Radeon RX 6650 XT

Intro

The Radeon HD 7990 has a clock speed of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 384-bit memory bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Compare that to the Radeon RX 6650 XT, which has core speeds of 2055 MHz on the GPU, and 2190 MHz on the 8192 MB of GDDR6 memory. It features 2048 SPUs along with 128 Texture Address Units 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

The Radeon HD 7990 should theoretically perform quite a bit faster than the Radeon RX 6650 XT overall. (explain)

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

Texel Rate

The Radeon RX 6650 XT is a bit (more or less 8%) faster with regards to anisotropic 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 should be much (about 116%) better at anti-aliasing than the Radeon HD 7990, and also will be able to handle higher resolutions better. (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 data (measured in megabytes per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high 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 texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at handling 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 can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called 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 - the lower the bandwidth is, the lower the potential to reach 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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