Radeon HD 6990 vs Radeon RX 580

Intro

Compare those specifications to the Radeon RX 580, which features core clock speeds of 1257 MHz on the GPU, and 2000 MHz on the 8192 MB of GDDR5 RAM. It features 2304 SPUs as well as 144 Texture Address Units 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

Theoretically speaking, the Radeon HD 6990 is 22% faster 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 a little 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 is a lot (about 32%) better at AA than the Radeon RX 580, and also able to handle higher screen 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: Memory bandwidth is the max amount of data (measured in MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 applied in one second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.