Radeon HD 7990 vs Radeon RX 580

Intro

Compare all that to the Radeon RX 580, which comes with a clock speed of 1257 MHz and a GDDR5 memory speed of 2000 MHz. It also makes use of a 256-bit bus, and uses a 14 nm design. It is comprised of 2304 SPUs, 144 TAUs, 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

Performance-wise, the Radeon HD 7990 should theoretically be a lot superior to the Radeon RX 580 overall. (explain)

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

Texel Rate

The Radeon HD 7990 will be a lot (more or less 34%) more effective at anisotropic 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 much (about 51%) more effective at FSAA than the Radeon RX 580, and also able to handle higher resolutions without losing too much performance. (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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.