Radeon HD 7990 vs Radeon RX 6500 XT

Intro

Compare those specs to the Radeon RX 6500 XT, which has a GPU core clock speed of 2200 MHz, and 4096 MB of GDDR6 memory running at 2250 MHz through a 64-bit bus. It also features 1024 Stream Processors, 64 TAUs, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6500 XT		107 Watts
Radeon HD 7990		375 Watts
	Difference: 268 Watts (250%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should in theory be a lot superior to the Radeon RX 6500 XT in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon RX 6500 XT		147456 MB/sec
	Difference: 428544 (291%)

Texel Rate

The Radeon HD 7990 will be much (approximately 73%) faster with regards to texture filtering than the Radeon RX 6500 XT. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon RX 6500 XT		140800 Mtexels/sec
	Difference: 102400 (73%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon RX 6500 XT is a better choice, though not by far. (explain)

Radeon RX 6500 XT		70400 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 9600 (16%)

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 maximum amount of data (counted in megabytes per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.