Radeon HD 7990 vs Radeon RX 6900 XT

Intro

Compare those specs to the Radeon RX 6900 XT, which makes use of a 7 nm design. AMD has set the core frequency at 1825 MHz. The GDDR6 RAM is set to run at a frequency of 2000 MHz on this specific card. It features 5120 SPUs along with 320 Texture Address Units and 128 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6900 XT		300 Watts
Radeon HD 7990		375 Watts
	Difference: 75 Watts (25%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should in theory be a little bit better than the Radeon RX 6900 XT in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon RX 6900 XT		524288 MB/sec
	Difference: 51712 (10%)

Texel Rate

The Radeon RX 6900 XT will be a lot (approximately 140%) more effective at AF than the Radeon HD 7990. (explain)

Radeon RX 6900 XT		584000 Mtexels/sec
Radeon HD 7990		243200 Mtexels/sec
	Difference: 340800 (140%)

Pixel Rate

The Radeon RX 6900 XT is a lot (more or less 284%) faster with regards to FSAA than the Radeon HD 7990, and will be able to handle higher resolutions better. (explain)

Radeon RX 6900 XT		233600 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 172800 (284%)

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 information (measured in MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.