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Radeon HD 4870 1GB vs Radeon RX 550

Intro

The Radeon HD 4870 1GB makes use of a 55 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 memory is set to run at a frequency of 900 MHz on this model. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

Compare those specifications to the Radeon RX 550, which uses a 14 nm design. AMD has clocked the core frequency at 1100 MHz. The GDDR5 RAM runs at a frequency of 1750 MHz on this particular model. It features 512 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

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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

In theory, the Radeon HD 4870 1GB should be just a bit faster than the Radeon RX 550 in general. (explain)

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

Texel Rate

The Radeon RX 550 is a small bit (more or less 17%) better at AF 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 is a lot (more or less 47%) better at AA than the Radeon HD 4870 1GB, and also will be capable of handling higher resolutions more effectively. (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

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Radeon RX 550

Amazon.com

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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: Memory bandwidth is the max amount of data (counted in MB per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 can be applied in one second. This number is calculated by multiplying the total texture units by the core clock 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 one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum 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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