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Radeon HD 7990 vs Radeon RX 590

Intro

The Radeon HD 7990 makes use of a 28 nm design. AMD has clocked the core frequency at 950 MHz. The GDDR5 RAM is set to run at a frequency of 1500 MHz on this particular model. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Compare those specs to the Radeon RX 590, which features a clock frequency of 1469 MHz and a GDDR5 memory frequency of 2000 MHz. It also features a 256-bit bus, and makes use of a 12 nm design. It is comprised of 2304 SPUs, 144 Texture Address Units, and 32 Raster Operation Units.

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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

As far as performance goes, the Radeon HD 7990 should theoretically be much superior to 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 is a bit (about 15%) better at anisotropic 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%) more effective at FSAA than the Radeon RX 590, and also should be capable of handling higher screen resolutions better. (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

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Radeon HD 7990

Amazon.com

Check prices at:

Radeon RX 590

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 7990 Radeon RX 590
Manufacturer AMD AMD
Year April 2013 November 2018
Code Name Malta Polaris 30
Memory 3072 MB (x2) 8192 MB
Core Speed 950 MHz (x2) 1469 MHz
Memory Speed 6000 MHz (x2) 8000 MHz
Power (Max TDP) 375 watts 175 watts
Bandwidth 576000 MB/sec 262144 MB/sec
Texel Rate 243200 Mtexels/sec 211536 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 47008 Mpixels/sec
Unified Shaders 2048 (x2) 2304
Texture Mapping Units 128 (x2) 144
Render Output Units 32 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit (x2) 256-bit
Fab Process 28 nm 12 nm
Transistors 4313 million 5700 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of data (in units of MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 7990

Amazon.com

Check prices at:

Radeon RX 590

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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