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Radeon R9 285 vs Radeon R9 M390X

Intro

The Radeon R9 285 uses a 28 nm design. AMD has set the core speed at 918 MHz. The GDDR5 memory works at a frequency of 1375 MHz on this specific card. It features 1792 SPUs as well as 112 TAUs and 32 Rasterization Operator Units.

Compare those specifications to the Radeon R9 M390X, which uses a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 memory is set to run at a frequency of 1250 MHz on this particular card. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 125 Watts
Radeon R9 285 190 Watts
Difference: 65 Watts (52%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 285 will be 10% faster than the Radeon R9 M390X overall, due to its greater data rate. (explain)

Radeon R9 285 176000 MB/sec
Radeon R9 M390X 160000 MB/sec
Difference: 16000 (10%)

Texel Rate

The Radeon R9 285 is a little bit (about 11%) more effective at AF than the Radeon R9 M390X. (explain)

Radeon R9 285 102816 Mtexels/sec
Radeon R9 M390X 92544 Mtexels/sec
Difference: 10272 (11%)

Pixel Rate

The Radeon R9 285 is much (about 27%) better at AA than the Radeon R9 M390X, and should be capable of handling higher resolutions more effectively. (explain)

Radeon R9 285 29376 Mpixels/sec
Radeon R9 M390X 23136 Mpixels/sec
Difference: 6240 (27%)

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 M390X

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 M390X
Manufacturer AMD AMD
Year September 2014 2015
Code Name Tonga PRO Tonga
Memory 2048 MB 4096 MB
Core Speed 918 MHz 723 MHz
Memory Speed 5500 MHz 5000 MHz
Power (Max TDP) 190 watts 125 watts
Bandwidth 176000 MB/sec 160000 MB/sec
Texel Rate 102816 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 29376 Mpixels/sec 23136 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 (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12.0 DirectX 12
OpenGL Version OpenGL 4.4 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better 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 processed per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon R9 285

Amazon.com

Check prices at:

Radeon R9 M390X

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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