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Radeon HD 7870 XT vs Radeon RX 470

Intro

The Radeon HD 7870 XT has a GPU core speed of 925 MHz, and the 2048 MB of GDDR5 memory runs at 1500 MHz through a 256-bit bus. It also features 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

Compare those specs to the Radeon RX 470, which has a clock frequency of 926 MHz and a GDDR5 memory speed of 1650 MHz. It also uses 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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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

Performance-wise, the Radeon RX 470 should in theory be a little bit superior to 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 quite a bit (about 33%) better at AF 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 high levels of AA is important to you, then the Radeon RX 470 is superior to the Radeon HD 7870 XT, but not by far. (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

Radeon HD 7870 XT

Radeon RX 470

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 largest amount of data (in units of MB per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 are processed per second. This is worked out by multiplying the total number of texture units of the card 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 processed per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Radeon HD 7870 XT

Radeon RX 470

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