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Radeon HD 7870 XT vs Radeon RX 5500 XT

Intro

The Radeon HD 7870 XT makes use of a 28 nm design. AMD has clocked the core speed at 925 MHz. The GDDR5 memory runs at a speed of 1500 MHz on this specific model. It features 1536 SPUs along with 96 Texture Address Units and 32 ROPs.

Compare that to the Radeon RX 5500 XT, which has a GPU core clock speed of 1717 MHz, and 8192 MB of GDDR6 memory running at 1750 MHz through a 128-bit bus. It also features 1408 SPUs, 88 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 5500 XT 130 Watts
Radeon HD 7870 XT 185 Watts
Difference: 55 Watts (42%)

Memory Bandwidth

The Radeon RX 5500 XT should in theory perform a little bit faster than the Radeon HD 7870 XT in general. (explain)

Radeon RX 5500 XT 229376 MB/sec
Radeon HD 7870 XT 192000 MB/sec
Difference: 37376 (19%)

Texel Rate

The Radeon RX 5500 XT will be quite a bit (about 70%) more effective at AF than the Radeon HD 7870 XT. (explain)

Radeon RX 5500 XT 151096 Mtexels/sec
Radeon HD 7870 XT 88800 Mtexels/sec
Difference: 62296 (70%)

Pixel Rate

The Radeon RX 5500 XT will be quite a bit (more or less 86%) better at full screen anti-aliasing than the Radeon HD 7870 XT, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon RX 5500 XT 54944 Mpixels/sec
Radeon HD 7870 XT 29600 Mpixels/sec
Difference: 25344 (86%)

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 7870 XT

Amazon.com

Check prices at:

Radeon RX 5500 XT

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 7870 XT Radeon RX 5500 XT
Manufacturer AMD AMD
Year November 2012 December 2019
Code Name Tahiti LE Navi 14 XTX
Memory 2048 MB 8192 MB
Core Speed 925 MHz 1717 MHz
Memory Speed 6000 MHz 3500 GB/s
Power (Max TDP) 185 watts 130 watts
Bandwidth 192000 MB/sec 229376 MB/sec
Texel Rate 88800 Mtexels/sec 151096 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 54944 Mpixels/sec
Unified Shaders 1536 1408
Texture Mapping Units 96 88
Render Output Units 32 32
Bus Type GDDR5 GDDR6
Bus Width 256-bit 128-bit
Fab Process 28 nm 7 nm
Transistors 4313 million 6400 million
Bus PCIe 3.0 x16 PCIe 4.0 ×16
DirectX Version DirectX 11.1 DirectX 12
OpenGL Version OpenGL 4.3 OpenGL 4.6

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 7870 XT

Amazon.com

Check prices at:

Radeon RX 5500 XT

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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