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Radeon R9 285 vs Radeon R9 M395X

Intro

The Radeon R9 285 makes use of a 28 nm design. AMD has clocked the core speed at 918 MHz. The GDDR5 RAM is set to run at a speed of 1375 MHz on this particular card. It features 1792 SPUs as well as 112 TAUs and 32 Rasterization Operator Units.

Compare those specifications to the Radeon R9 M395X, which comes with clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X 125 Watts
Radeon R9 285 190 Watts
Difference: 65 Watts (52%)

Memory Bandwidth

In theory, the Radeon R9 285 is 10% quicker than the Radeon R9 M395X in general, because of its higher data rate. (explain)

Radeon R9 285 176000 MB/sec
Radeon R9 M395X 160000 MB/sec
Difference: 16000 (10%)

Texel Rate

The Radeon R9 285 will be a small bit (about 11%) more effective at texture filtering than the Radeon R9 M395X. (explain)

Radeon R9 285 102816 Mtexels/sec
Radeon R9 M395X 92544 Mtexels/sec
Difference: 10272 (11%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 285 is a better choice, by far. (explain)

Radeon R9 285 29376 Mpixels/sec
Radeon R9 M395X 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 M395X

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 M395X
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: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 processed per second. This figure is calculated 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon R9 285

Amazon.com

Check prices at:

Radeon R9 M395X

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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