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Radeon R9 270 vs Radeon RX 470

Intro

The Radeon R9 270 comes with a GPU clock speed of 900 MHz, and the 2048 MB of GDDR5 memory is set to run at 1400 MHz through a 256-bit bus. It also features 1280 SPUs, 80 TAUs, and 32 ROPs.

Compare those specs to the Radeon RX 470, which features a core clock frequency of 926 MHz and a GDDR5 memory frequency of 1650 MHz. It also uses a 256-bit bus, and makes use of a 14 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 ROPs.

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

In theory, the Radeon RX 470 will be 18% quicker than the Radeon R9 270 overall, because of its higher bandwidth. (explain)

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

Texel Rate

The Radeon RX 470 is quite a bit (approximately 65%) faster with regards to AF than the Radeon R9 270. (explain)

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

Pixel Rate

The Radeon RX 470 is just a bit (more or less 3%) faster with regards to AA than the Radeon R9 270, and able to handle higher resolutions while still performing well. (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 (in units of MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the 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 texture map elements (texels) that can be processed per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the 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 speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially 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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