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Radeon R9 270 vs Radeon RX 470

Intro

The Radeon R9 270 makes use of a 28 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 memory runs at a frequency of 1400 MHz on this specific card. It features 1280 SPUs along with 80 TAUs and 32 ROPs.

Compare all that to the Radeon RX 470, which uses a 14 nm design. AMD has clocked the core frequency at 926 MHz. The GDDR5 memory works at a speed of 1650 MHz on this card. It features 2048 SPUs as well as 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 270 150 Watts
Difference: 30 Watts (25%)

Memory Bandwidth

Theoretically, the Radeon RX 470 should be a little bit faster than the Radeon R9 270 overall. (explain)

Radeon RX 470 211200 MB/sec
Radeon R9 270 179200 MB/sec
Difference: 32000 (18%)

Texel Rate

The Radeon RX 470 should be quite a bit (about 65%) better at AF than the Radeon R9 270. (explain)

Radeon RX 470 118528 Mtexels/sec
Radeon R9 270 72000 Mtexels/sec
Difference: 46528 (65%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon RX 470 is the winner, though only just barely. (explain)

Radeon RX 470 29632 Mpixels/sec
Radeon R9 270 28800 Mpixels/sec
Difference: 832 (3%)

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 270

Radeon RX 470

Specifications

Display Specifications

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Model Radeon R9 270 Radeon RX 470
Manufacturer AMD AMD
Year November 2013 August 2016
Code Name Curacao Pro Polaris 10
Memory 2048 MB 8192 MB
Core Speed 900 MHz 926 MHz
Memory Speed 5600 MHz 6600 MHz
Power (Max TDP) 150 watts 120 watts
Bandwidth 179200 MB/sec 211200 MB/sec
Texel Rate 72000 Mtexels/sec 118528 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 29632 Mpixels/sec
Unified Shaders 1280 2048
Texture Mapping Units 80 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 14 nm
Transistors 2800 million 5700 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.2 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, 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 amount of pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units 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 is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Radeon R9 270

Radeon RX 470

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