Radeon HD 7990 vs Radeon RX 6650 XT

Intro

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.

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 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

Specifications

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.