Radeon HD 7990 vs Radeon RX 6650 XT

Intro

Compare all that to the Radeon RX 6650 XT, which makes use of a 7 nm design. AMD has clocked the core speed at 2055 MHz. The GDDR6 memory is set to run at a speed of 2190 MHz on this specific card. It features 2048 SPUs as well as 128 Texture Address Units 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 7990		375 Watts
	Difference: 199 Watts (113%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should in theory be much superior to 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 a little bit (approximately 8%) faster with regards to AF 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 is much (more or less 116%) more effective at FSAA than the Radeon HD 7990, and will be capable of handling higher resolutions without losing too much performance. (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

Specifications

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.