Radeon HD 6990 vs Radeon RX 580

Intro

Compare all that to the Radeon RX 580, which has a GPU core clock speed of 1257 MHz, and 8192 MB of GDDR5 RAM running at 2000 MHz through a 256-bit bus. It also is comprised of 2304 Stream Processors, 144 Texture Address Units, and 32 Raster Operation Units.

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 RX 580		13630 points
Radeon HD 6990		5820 points
	Difference: 7810 (134%)

Ethereum Mining Hash Rate

Radeon RX 580		28 Mh/s
Radeon HD 6990		24 Mh/s
	Difference: 4 (17%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 580		185 Watts
Radeon HD 6990		375 Watts
	Difference: 190 Watts (103%)

Memory Bandwidth

In theory, the Radeon HD 6990 will be 22% quicker than the Radeon RX 580 in general, because of its higher data rate. (explain)

Radeon HD 6990		320000 MB/sec
Radeon RX 580		262144 MB/sec
	Difference: 57856 (22%)

Texel Rate

The Radeon RX 580 should be just a bit (about 14%) more effective at AF than the Radeon HD 6990. (explain)

Radeon RX 580		181008 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 21648 (14%)

Pixel Rate

The Radeon HD 6990 is a lot (more or less 32%) faster with regards to anti-aliasing than the Radeon RX 580, and also capable of handling higher resolutions while still performing well. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon RX 580		40224 Mpixels/sec
	Difference: 12896 (32%)

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 maximum amount of data (measured in megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, the result 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, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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 ability to reach the max fill rate.