Radeon HD 7990 vs Radeon RX 580

Intro

Compare those specs to the Radeon RX 580, which comes with GPU clock speed of 1257 MHz, and 8192 MB of GDDR5 RAM running at 2000 MHz through a 256-bit bus. It also is made up of 2304 SPUs, 144 Texture Address Units, and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7990		15520 points
Radeon RX 580		13630 points
	Difference: 1890 (14%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon RX 580		28 Mh/s
	Difference: 4 (14%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon RX 580		315 Sol/s
	Difference: 198 (63%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 580		185 Watts
Radeon HD 7990		375 Watts
	Difference: 190 Watts (103%)

Memory Bandwidth

The Radeon HD 7990 should in theory be a lot faster than the Radeon RX 580 in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon RX 580		262144 MB/sec
	Difference: 313856 (120%)

Texel Rate

The Radeon HD 7990 will be much (more or less 34%) better at texture filtering than the Radeon RX 580. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon RX 580		181008 Mtexels/sec
	Difference: 62192 (34%)

Pixel Rate

The Radeon HD 7990 should be quite a bit (more or less 51%) more effective at full screen anti-aliasing than the Radeon RX 580, and also capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon RX 580		40224 Mpixels/sec
	Difference: 20576 (51%)

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 (in units of MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.