Radeon HD 6990 vs Radeon RX 5600

Intro

Compare that to the Radeon RX 5600, which comes with a GPU core clock speed of 1375 MHz, and 6144 MB of GDDR6 memory running at 1500 MHz through a 192-bit bus. It also is made up of 2048 SPUs, 128 Texture Address Units, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 5600		150 Watts
Radeon HD 6990		375 Watts
	Difference: 225 Watts (150%)

Memory Bandwidth

In theory, the Radeon HD 6990 is 9% faster than the Radeon RX 5600 overall, because of its higher bandwidth. (explain)

Radeon HD 6990		320000 MB/sec
Radeon RX 5600		294912 MB/sec
	Difference: 25088 (9%)

Texel Rate

The Radeon RX 5600 is a bit (about 10%) faster with regards to texture filtering than the Radeon HD 6990. (explain)

Radeon RX 5600		176000 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 16640 (10%)

Pixel Rate

The Radeon RX 5600 is much (about 66%) more effective at anti-aliasing than the Radeon HD 6990, and will be able to handle higher screen resolutions better. (explain)

Radeon RX 5600		88000 Mpixels/sec
Radeon HD 6990		53120 Mpixels/sec
	Difference: 34880 (66%)

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 max amount of data (in units of megabytes per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units of the card 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 processed in a second.

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