Radeon HD 6990 vs Radeon RX 580

Intro

Compare that to the Radeon RX 580, which features 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 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

As far as performance goes, the Radeon HD 6990 should theoretically be much superior to the Radeon RX 580 in general. (explain)

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

Texel Rate

The Radeon RX 580 will be a bit (approximately 14%) better 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 should be quite a bit (about 32%) better at full screen anti-aliasing than the Radeon RX 580, and will be able to handle higher resolutions without slowing down too much. (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 (in units of megabytes per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 processed per second. This number is worked out by multiplying the total number of texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.