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Radeon HD 7990 vs Radeon RX 5600 XT

Intro

The Radeon HD 7990 uses a 28 nm design. AMD has clocked the core speed at 950 MHz. The GDDR5 memory works at a speed of 1500 MHz on this card. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

Compare those specifications to the Radeon RX 5600 XT, which makes use of a 7 nm design. AMD has set the core frequency at 1375 MHz. The GDDR6 RAM runs at a frequency of 14000 MHz on this model. It features 2304 SPUs along with 144 Texture Address Units and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 5600 XT		160 Watts
Radeon HD 7990		375 Watts
	Difference: 215 Watts (134%)

Memory Bandwidth

In theory, the Radeon HD 7990 should be 67% quicker than the Radeon RX 5600 XT overall, because of its greater data rate. (explain)

Radeon HD 7990		576000 MB/sec
Radeon RX 5600 XT		344064 MB/sec
	Difference: 231936 (67%)

Texel Rate

The Radeon HD 7990 will be a lot (about 23%) better at AF than the Radeon RX 5600 XT. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon RX 5600 XT		198000 Mtexels/sec
	Difference: 45200 (23%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon RX 5600 XT is superior to the Radeon HD 7990, and very much so. (explain)

Radeon RX 5600 XT		88000 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 27200 (45%)

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

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Radeon HD 7990

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Radeon RX 5600 XT

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model	Radeon HD 7990	Radeon RX 5600 XT
Manufacturer	AMD	AMD
Year	April 2013	January 2020
Code Name	Malta	Navi 10 XLE
Memory	3072 MB (x2)	6144 MB
Core Speed	950 MHz (x2)	1375 MHz
Memory Speed	6000 MHz (x2)	28000 GB/s
Power (Max TDP)	375 watts	160 watts
Bandwidth	576000 MB/sec	344064 MB/sec
Texel Rate	243200 Mtexels/sec	198000 Mtexels/sec
Pixel Rate	60800 Mpixels/sec	88000 Mpixels/sec
Unified Shaders	2048 (x2)	2304
Texture Mapping Units	128 (x2)	144
Render Output Units	32 (x2)	64
Bus Type	GDDR5	GDDR6
Bus Width	384-bit (x2)	192-bit
Fab Process	28 nm	7 nm
Transistors	4313 million	10300 million
Bus	PCIe 3.0 x16	PCIe 4.0 ×16
DirectX Version	DirectX 11.1	DirectX 12
OpenGL Version	OpenGL 4.3	OpenGL 4.6

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is worked out 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 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 most pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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