Radeon HD 6990 vs Radeon RX 480 4GB

Intro

Compare those specs to the Radeon RX 480 4GB, which uses a 14 nm design. AMD has set the core speed at 1120 MHz. The GDDR5 RAM is set to run at a frequency of 1750 MHz on this card. It features 2304 SPUs along with 144 Texture Address Units and 32 Rasterization Operator 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.

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Radeon RX 480 4GB		25 Mh/s
Radeon HD 6990		24 Mh/s
	Difference: 1 (4%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 480 4GB		150 Watts
Radeon HD 6990		375 Watts
	Difference: 225 Watts (150%)

Memory Bandwidth

The Radeon HD 6990 should theoretically perform a lot faster than the Radeon RX 480 4GB overall. (explain)

Radeon HD 6990		320000 MB/sec
Radeon RX 480 4GB		229376 MB/sec
	Difference: 90624 (40%)

Texel Rate

The Radeon RX 480 4GB should be a small bit (approximately 1%) more effective at anisotropic filtering than the Radeon HD 6990. (explain)

Radeon RX 480 4GB		161280 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 1920 (1%)

Pixel Rate

The Radeon HD 6990 should be much (more or less 48%) more effective at FSAA than the Radeon RX 480 4GB, and should be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon RX 480 4GB		35840 Mpixels/sec
	Difference: 17280 (48%)

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.

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Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses 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, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.