Radeon HD 7990 vs Radeon RX 580

Intro

Compare those specs to the Radeon RX 580, which features a GPU core clock speed of 1257 MHz, and 8192 MB of GDDR5 memory set to run at 2000 MHz through a 256-bit bus. It also is comprised of 2304 Stream Processors, 144 TAUs, and 32 ROPs.

Display Graphs

Hide Graphs

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

Theoretically speaking, the Radeon HD 7990 should be 120% faster than the Radeon RX 580 in general, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 7990 should be quite a bit (more or less 34%) faster with regards to AF 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 will be much (approximately 51%) better at anti-aliasing than the Radeon RX 580, and also will be able to handle higher screen resolutions better. (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 maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.