Radeon R9 285 vs Radeon R9 M395X

Intro

Compare that to the Radeon R9 M395X, which comes with GPU core speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 Texture Address Units, and 32 ROPs.

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 overall, due to its higher bandwidth. (explain)

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

Texel Rate

The Radeon R9 285 is just a bit (about 11%) better at anisotropic 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 using lots of anti-aliasing is important to you, then the Radeon R9 285 is a better choice, and very much so. (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

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

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