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Radeon R9 285 vs Radeon RX 470

Intro

The Radeon R9 285 features a core clock speed of 918 MHz and a GDDR5 memory speed of 1375 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It is comprised of 1792 SPUs, 112 TAUs, and 32 ROPs.

Compare those specifications to the Radeon RX 470, which features GPU core speed of 926 MHz, and 8192 MB of GDDR5 memory set to run at 1650 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 128 Texture Address Units, 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 285 190 Watts
Difference: 70 Watts (58%)

Memory Bandwidth

As far as performance goes, the Radeon RX 470 should in theory be just a bit superior to the Radeon R9 285 overall. (explain)

Radeon RX 470 211200 MB/sec
Radeon R9 285 176000 MB/sec
Difference: 35200 (20%)

Texel Rate

The Radeon RX 470 will be a little bit (about 15%) faster with regards to AF than the Radeon R9 285. (explain)

Radeon RX 470 118528 Mtexels/sec
Radeon R9 285 102816 Mtexels/sec
Difference: 15712 (15%)

Pixel Rate

The Radeon RX 470 will be a small bit (more or less 1%) more effective at AA than the Radeon R9 285, and will be capable of handling higher resolutions better. (explain)

Radeon RX 470 29632 Mpixels/sec
Radeon R9 285 29376 Mpixels/sec
Difference: 256 (1%)

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

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Radeon R9 285

Amazon.com

Radeon RX 470

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon R9 285 Radeon RX 470
Manufacturer AMD AMD
Year September 2014 August 2016
Code Name Tonga PRO Polaris 10
Memory 2048 MB 8192 MB
Core Speed 918 MHz 926 MHz
Memory Speed 5500 MHz 6600 MHz
Power (Max TDP) 190 watts 120 watts
Bandwidth 176000 MB/sec 211200 MB/sec
Texel Rate 102816 Mtexels/sec 118528 Mtexels/sec
Pixel Rate 29376 Mpixels/sec 29632 Mpixels/sec
Unified Shaders 1792 2048
Texture Mapping Units 112 128
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 4.4 OpenGL 4.5

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines 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 fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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