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Radeon R9 285 vs Radeon R9 380X

Intro

The Radeon R9 285 comes with clock speeds of 918 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 RAM. It features 1792 SPUs along with 112 TAUs and 32 ROPs.

Compare those specs to the Radeon R9 380X, which features a clock speed of 970 MHz and a GDDR5 memory speed of 1425 MHz. It also features a 256-bit bus, and uses a 28 nm design. It is made up of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 380X 9519 points
Radeon R9 285 8500 points
Difference: 1019 (12%)

Ethereum Mining Hash Rate

Radeon R9 380X 19 Mh/s
Radeon R9 285 18 Mh/s
Difference: 1 (6%)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon R9 380X is 4% faster than the Radeon R9 285 overall, due to its higher data rate. (explain)

Radeon R9 380X 182400 MB/sec
Radeon R9 285 176000 MB/sec
Difference: 6400 (4%)

Texel Rate

The Radeon R9 380X should be much (about 21%) more effective at AF than the Radeon R9 285. (explain)

Radeon R9 380X 124160 Mtexels/sec
Radeon R9 285 102816 Mtexels/sec
Difference: 21344 (21%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 380X is a better choice, though only just barely. (explain)

Radeon R9 380X 31040 Mpixels/sec
Radeon R9 285 29376 Mpixels/sec
Difference: 1664 (6%)

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

Check prices at:

Radeon R9 380X

Amazon.com

Check prices at:

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 R9 380X
Manufacturer AMD AMD
Year September 2014 November 2015
Code Name Tonga PRO Tonga XT
Memory 2048 MB 4096 MB
Core Speed 918 MHz 970 MHz
Memory Speed 5500 MHz 5700 MHz
Power (Max TDP) 190 watts 190 watts
Bandwidth 176000 MB/sec 182400 MB/sec
Texel Rate 102816 Mtexels/sec 124160 Mtexels/sec
Pixel Rate 29376 Mpixels/sec 31040 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 28 nm
Transistors 5000 million 5000 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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon R9 285

Amazon.com

Check prices at:

Radeon R9 380X

Amazon.com

Check prices at:

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.

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