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Radeon HD 4870 1GB vs Radeon RX 550

Intro

The Radeon HD 4870 1GB features a GPU core speed of 750 MHz, and the 1024 MB of GDDR5 memory runs at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon RX 550, which has a core clock frequency of 1100 MHz and a GDDR5 memory frequency of 1750 MHz. It also makes use of a 128-bit bus, and makes use of a 14 nm design. It is comprised of 512 SPUs, 32 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 550 50 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 100 Watts (200%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 1GB should be a little bit faster than the Radeon RX 550 overall. (explain)

Radeon HD 4870 1GB 115200 MB/sec
Radeon RX 550 114688 MB/sec
Difference: 512 (0%)

Texel Rate

The Radeon RX 550 will be a bit (about 17%) more effective at texture filtering than the Radeon HD 4870 1GB. (explain)

Radeon RX 550 35200 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 5200 (17%)

Pixel Rate

The Radeon RX 550 will be quite a bit (more or less 47%) more effective at full screen anti-aliasing than the Radeon HD 4870 1GB, and also should be able to handle higher resolutions without slowing down too much. (explain)

Radeon RX 550 17600 Mpixels/sec
Radeon HD 4870 1GB 12000 Mpixels/sec
Difference: 5600 (47%)

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 4870 1GB

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 4870 1GB Radeon RX 550
Manufacturer AMD AMD
Year Jun 25, 2008 April 2017
Code Name RV770 XT Polaris 12
Memory 1024 MB 2048 MB
Core Speed 750 MHz 1100 MHz
Memory Speed 3600 MHz 7000 MHz
Power (Max TDP) 150 watts 50 watts
Bandwidth 115200 MB/sec 114688 MB/sec
Texel Rate 30000 Mtexels/sec 35200 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 17600 Mpixels/sec
Unified Shaders 800(160x5) 512
Texture Mapping Units 40 32
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 14 nm
Transistors 956 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 data (counted in MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, 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 anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics 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 maximum number of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 4870 1GB

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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