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Radeon HD 7870 XT vs Radeon RX 470

Intro

The Radeon HD 7870 XT comes with clock speeds of 925 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 96 TAUs and 32 ROPs.

Compare those specs to the Radeon RX 470, which features a core clock speed of 926 MHz and a GDDR5 memory speed of 1650 MHz. It also makes use of a 256-bit bus, and makes use of a 14 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 470 120 Watts
Radeon HD 7870 XT 185 Watts
Difference: 65 Watts (54%)

Memory Bandwidth

The Radeon RX 470, in theory, should be a little bit faster than the Radeon HD 7870 XT overall. (explain)

Radeon RX 470 211200 MB/sec
Radeon HD 7870 XT 192000 MB/sec
Difference: 19200 (10%)

Texel Rate

The Radeon RX 470 is much (approximately 33%) faster with regards to texture filtering than the Radeon HD 7870 XT. (explain)

Radeon RX 470 118528 Mtexels/sec
Radeon HD 7870 XT 88800 Mtexels/sec
Difference: 29728 (33%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon RX 470 is a better choice, though only just barely. (explain)

Radeon RX 470 29632 Mpixels/sec
Radeon HD 7870 XT 29600 Mpixels/sec
Difference: 32 (0%)

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

Radeon RX 470

Amazon.com

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 470
Manufacturer AMD AMD
Year November 2012 August 2016
Code Name Tahiti LE Polaris 10
Memory 2048 MB 8192 MB
Core Speed 925 MHz 926 MHz
Memory Speed 6000 MHz 6600 MHz
Power (Max TDP) 185 watts 120 watts
Bandwidth 192000 MB/sec 211200 MB/sec
Texel Rate 88800 Mtexels/sec 118528 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 29632 Mpixels/sec
Unified Shaders 1536 2048
Texture Mapping Units 96 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 14 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: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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