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Radeon HD 7950 vs Radeon RX 6650 XT

Intro

The Radeon HD 7950 uses a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this card. It features 1792 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator Units.

Compare that to the Radeon RX 6650 XT, which has core clock speeds of 2055 MHz on the GPU, and 2190 MHz on the 8192 MB of GDDR6 memory. It features 2048 SPUs as well as 128 TAUs and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6650 XT 176 Watts
Radeon HD 7950 200 Watts
Difference: 24 Watts (14%)

Memory Bandwidth

The Radeon RX 6650 XT, in theory, should perform a small bit faster than the Radeon HD 7950 overall. (explain)

Radeon RX 6650 XT 287072 MB/sec
Radeon HD 7950 240000 MB/sec
Difference: 47072 (20%)

Texel Rate

The Radeon RX 6650 XT is quite a bit (approximately 194%) better at anisotropic filtering than the Radeon HD 7950. (explain)

Radeon RX 6650 XT 263040 Mtexels/sec
Radeon HD 7950 89600 Mtexels/sec
Difference: 173440 (194%)

Pixel Rate

The Radeon RX 6650 XT will be a lot (more or less 414%) better at AA than the Radeon HD 7950, and will be able to handle higher screen resolutions while still performing well. (explain)

Radeon RX 6650 XT 131520 Mpixels/sec
Radeon HD 7950 25600 Mpixels/sec
Difference: 105920 (414%)

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.

Price Comparison

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Radeon HD 7950

Amazon.com

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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 7950 Radeon RX 6650 XT
Manufacturer AMD AMD
Year January 2012 May 2022
Code Name Tahiti Pro Navi 23
Memory 1536 MB 8192 MB
Core Speed 800 MHz 2055 MHz
Memory Speed 5000 MHz 4380 GB/s
Power (Max TDP) 200 watts 176 watts
Bandwidth 240000 MB/sec 287072 MB/sec
Texel Rate 89600 Mtexels/sec 263040 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 131520 Mpixels/sec
Unified Shaders 1792 2048
Texture Mapping Units 112 128
Render Output Units 32 64
Bus Type GDDR5 GDDR6
Bus Width 384-bit 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 4.2 OpenGL 4.6

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units of the card by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 7950

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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