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Radeon R9 380X vs Radeon RX 470

Intro

The Radeon R9 380X has clock speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Compare that to the Radeon RX 470, which makes use of a 14 nm design. AMD has set the core speed at 926 MHz. The GDDR5 RAM is set to run at a frequency of 1650 MHz on this particular model. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 470 120 Watts
Radeon R9 380X 190 Watts
Difference: 70 Watts (58%)

Memory Bandwidth

The Radeon RX 470, in theory, should be a bit faster than the Radeon R9 380X overall. (explain)

Radeon RX 470 211200 MB/sec
Radeon R9 380X 182400 MB/sec
Difference: 28800 (16%)

Texel Rate

The Radeon R9 380X will be a small bit (more or less 5%) faster with regards to anisotropic filtering than the Radeon RX 470. (explain)

Radeon R9 380X 124160 Mtexels/sec
Radeon RX 470 118528 Mtexels/sec
Difference: 5632 (5%)

Pixel Rate

The Radeon R9 380X should be a little bit (more or less 5%) more effective at FSAA than the Radeon RX 470, and also will be able to handle higher resolutions more effectively. (explain)

Radeon R9 380X 31040 Mpixels/sec
Radeon RX 470 29632 Mpixels/sec
Difference: 1408 (5%)

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 R9 380X

Radeon RX 470

Specifications

Display Specifications

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Model Radeon R9 380X Radeon RX 470
Manufacturer AMD AMD
Year November 2015 August 2016
Code Name Tonga XT Polaris 10
Memory 4096 MB 8192 MB
Core Speed 970 MHz 926 MHz
Memory Speed 5700 MHz 6600 MHz
Power (Max TDP) 190 watts 120 watts
Bandwidth 182400 MB/sec 211200 MB/sec
Texel Rate 124160 Mtexels/sec 118528 Mtexels/sec
Pixel Rate 31040 Mpixels/sec 29632 Mpixels/sec
Unified Shaders 2048 2048
Texture Mapping Units 128 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 14 nm
Transistors 5000 million 5700 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12.0 DirectX 12.0
OpenGL Version OpenGL 4.5 OpenGL 4.5

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes 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 ability to reach the maximum fill rate.

Radeon R9 380X

Radeon RX 470

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