Radeon HD 7990 vs Radeon RX 6950 XT

Intro

Compare those specifications to the Radeon RX 6950 XT, which makes use of a 7 nm design. AMD has clocked the core speed at 1925 MHz. The GDDR6 memory runs at a speed of 2250 MHz on this particular card. It features 5120 SPUs as well as 320 TAUs 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

The Radeon RX 6950 XT should in theory be a small bit faster 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 quite a bit (approximately 153%) more effective at anisotropic 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

The Radeon RX 6950 XT should be much (more or less 305%) more effective at FSAA than the Radeon HD 7990, and also able to handle higher screen resolutions without losing too much performance. (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: Bandwidth is the largest amount of information (measured in MB 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 RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 amount of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the graphics 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 amount of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.