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Radeon HD 4790 vs Radeon RX 550

Intro

The Radeon HD 4790 has a GPU clock speed of 600 MHz, and the 512 MB of GDDR5 memory is set to run at 800 MHz through a 256-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon RX 550, which comes with a core clock frequency of 1100 MHz and a GDDR5 memory speed of 1750 MHz. It also uses a 128-bit memory bus, and makes use of a 14 nm design. It is comprised of 512 SPUs, 32 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon RX 550 should perform a small bit faster than the Radeon HD 4790 overall. (explain)

Radeon RX 550 114688 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 12288 (12%)

Texel Rate

The Radeon RX 550 is a lot (about 83%) better at AF than the Radeon HD 4790. (explain)

Radeon RX 550 35200 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 16000 (83%)

Pixel Rate

The Radeon RX 550 will be quite a bit (more or less 83%) more effective at anti-aliasing than the Radeon HD 4790, and should be able to handle higher screen resolutions while still performing well. (explain)

Radeon RX 550 17600 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 8000 (83%)

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.

Price Comparison

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Radeon HD 4790

Amazon.com

Check prices at:

Radeon RX 550

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 4790 Radeon RX 550
Manufacturer AMD AMD
Year 2009 April 2017
Code Name RV790 Polaris 12
Memory 512 MB 2048 MB
Core Speed 600 MHz 1100 MHz
Memory Speed 3200 MHz 7000 MHz
Power (Max TDP) (Unknown) watts 50 watts
Bandwidth 102400 MB/sec 114688 MB/sec
Texel Rate 19200 Mtexels/sec 35200 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 17600 Mpixels/sec
Unified Shaders 640(128x5) 512
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 14 nm
Transistors 959 million 2200 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 12.0
OpenGL Version OpenGL 3.0 OpenGL 4.5

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This number is calculated by multiplying the total amount 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour 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 fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 4790

Amazon.com

Check prices at:

Radeon RX 550

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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