Radeon HD 6990 vs Radeon RX 580

Intro

Compare all that to the Radeon RX 580, which uses a 14 nm design. AMD has clocked the core speed at 1257 MHz. The GDDR5 memory runs at a speed of 2000 MHz on this specific model. It features 2304 SPUs along with 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 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

The Radeon HD 6990 should theoretically be a lot faster than 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 is just a bit (approximately 14%) better at anisotropic filtering 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 quite a bit (about 32%) better at full screen anti-aliasing than the Radeon RX 580, and also will be capable of handling higher screen resolutions more effectively. (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 largest amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a 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. The figure is worked out by multiplying the number of Raster Operations Pipelines 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 output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.