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Radeon HD 7870 XT vs Radeon RX 470


Intro

The Radeon HD 7870 XT uses a 28 nm design. AMD has clocked the core frequency at 925 MHz. The GDDR5 memory is set to run at a frequency of 1500 MHz on this specific model. It features 1536 SPUs as well as 96 Texture Address Units and 32 Rasterization Operator Units.

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

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon RX 470 11810 points
Radeon HD 7870 XT 6390 points
Difference: 5420 (85%)

Ethereum Mining Hash Rate

Radeon RX 470 26 Mh/s
Radeon HD 7870 XT 15 Mh/s
Difference: 11 (73%)

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

In theory, the Radeon RX 470 should be just a bit faster than the Radeon HD 7870 XT in general. (explain)

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

Texel Rate

The Radeon RX 470 will be much (more or less 33%) better at 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 using a high screen resolution is important to you, then the Radeon RX 470 is the winner, not by a very large margin though. (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: Bandwidth is the max amount of information (in units of megabytes per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - 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

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.

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