Radeon HD 7990 vs Radeon RX 6650 XT

Intro

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

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

The Radeon HD 7990 should in theory be 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 should be a small bit (more or less 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

If using high levels of AA is important to you, then the Radeon RX 6650 XT is superior to the Radeon HD 7990, by far. (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: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. 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 output rate is also dependant 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.