Radeon HD 7990 vs Radeon RX 6950 XT

Intro

Compare those specs to the Radeon RX 6950 XT, which features a clock frequency of 1925 MHz and a GDDR6 memory speed of 2250 MHz. It also features a 256-bit bus, and makes use of a 7 nm design. It features 5120 SPUs, 320 Texture Address Units, and 128 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6950 XT		335 Watts
Radeon HD 7990		375 Watts
	Difference: 40 Watts (12%)

Memory Bandwidth

In theory, the Radeon RX 6950 XT should be 2% quicker than the Radeon HD 7990 overall, because of its greater data rate. (explain)

Radeon RX 6950 XT		589824 MB/sec
Radeon HD 7990		576000 MB/sec
	Difference: 13824 (2%)

Texel Rate

The Radeon RX 6950 XT should be a lot (about 153%) faster with regards to AF than the Radeon HD 7990. (explain)

Radeon RX 6950 XT		616000 Mtexels/sec
Radeon HD 7990		243200 Mtexels/sec
	Difference: 372800 (153%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon RX 6950 XT is the winner, by far. (explain)

Radeon RX 6950 XT		246400 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 185600 (305%)

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 information (counted in MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, 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 is calculated 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock 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 also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.