Radeon HD 7990 vs Radeon RX 5500

Intro

Compare those specifications to the Radeon RX 5500, which comes with a clock speed of 1670 MHz and a GDDR6 memory frequency of 1750 MHz. It also makes use of a 128-bit bus, and uses a 7 nm design. It is made up of 1408 SPUs, 88 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 5500		150 Watts
Radeon HD 7990		375 Watts
	Difference: 225 Watts (150%)

Memory Bandwidth

The Radeon HD 7990, in theory, should perform much faster than the Radeon RX 5500 overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon RX 5500		229376 MB/sec
	Difference: 346624 (151%)

Texel Rate

The Radeon HD 7990 should be a lot (more or less 65%) faster with regards to anisotropic filtering than the Radeon RX 5500. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon RX 5500		146960 Mtexels/sec
	Difference: 96240 (65%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7990 is a better choice, though not by far. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon RX 5500		53440 Mpixels/sec
	Difference: 7360 (14%)

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 (measured in megabytes per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses 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 number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.