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Radeon R9 270X vs Radeon RX 470

Intro

The Radeon R9 270X uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM works at a speed of 1400 MHz on this particular card. It features 1280 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 470 120 Watts
Radeon R9 270X 180 Watts
Difference: 60 Watts (50%)

Memory Bandwidth

The Radeon RX 470 should in theory be a little bit faster than the Radeon R9 270X in general. (explain)

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

Texel Rate

The Radeon RX 470 should be quite a bit (about 48%) more effective at anisotropic filtering than the Radeon R9 270X. (explain)

Radeon RX 470 118528 Mtexels/sec
Radeon R9 270X 80000 Mtexels/sec
Difference: 38528 (48%)

Pixel Rate

The Radeon R9 270X is just a bit (more or less 8%) more effective at FSAA than the Radeon RX 470, and also will be able to handle higher resolutions better. (explain)

Radeon R9 270X 32000 Mpixels/sec
Radeon RX 470 29632 Mpixels/sec
Difference: 2368 (8%)

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 270X

Radeon RX 470

Specifications

Display Specifications

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Model Radeon R9 270X Radeon RX 470
Manufacturer AMD AMD
Year October 2013 August 2016
Code Name Curacao XT Polaris 10
Memory 2048 MB 8192 MB
Core Speed 1000 MHz 926 MHz
Memory Speed 5600 MHz 6600 MHz
Power (Max TDP) 180 watts 120 watts
Bandwidth 179200 MB/sec 211200 MB/sec
Texel Rate 80000 Mtexels/sec 118528 Mtexels/sec
Pixel Rate 32000 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 largest amount of information (counted in megabytes per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Radeon R9 270X

Radeon RX 470

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