Radeon HD 7990 vs Radeon RX 590

Intro

Compare all that to the Radeon RX 590, which comes with GPU core speed of 1469 MHz, and 8192 MB of GDDR5 RAM set to run at 2000 MHz through a 256-bit bus. It also is made up of 2304 Stream Processors, 144 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 590		175 Watts
Radeon HD 7990		375 Watts
	Difference: 200 Watts (114%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should theoretically be quite a bit better than the Radeon RX 590 overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon RX 590		262144 MB/sec
	Difference: 313856 (120%)

Texel Rate

The Radeon HD 7990 should be a bit (approximately 15%) more effective at texture filtering than the Radeon RX 590. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon RX 590		211536 Mtexels/sec
	Difference: 31664 (15%)

Pixel Rate

The Radeon HD 7990 will be quite a bit (about 29%) faster with regards to full screen anti-aliasing than the Radeon RX 590, and also should be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon RX 590		47008 Mpixels/sec
	Difference: 13792 (29%)

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 (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 number of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.