Radeon HD 7990 vs Radeon RX 6950 XT

Intro

Compare those specs to the Radeon RX 6950 XT, which features GPU core speed of 1925 MHz, and 16384 MB of GDDR6 RAM set to run at 2250 MHz through a 256-bit bus. It also features 5120 SPUs, 320 Texture Address Units, and 128 Raster Operation Units.

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

Performance-wise, the Radeon RX 6950 XT should theoretically be just a bit better than the Radeon HD 7990 in general. (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 much (approximately 153%) more effective at texture filtering 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 a large margin. (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 maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better 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 amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.