Radeon R9 390X 8G vs Radeon R9 M395X

Intro

Compare that to the Radeon R9 M395X, which features GPU core speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also features 2048 Stream Processors, 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 R9 M395X		125 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 150 Watts (120%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390X 8G will be 140% quicker than the Radeon R9 M395X overall, due to its greater bandwidth. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 224000 (140%)

Texel Rate

The Radeon R9 390X 8G will be much (about 100%) faster with regards to AF than the Radeon R9 M395X. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon R9 M395X		92544 Mtexels/sec
	Difference: 92256 (100%)

Pixel Rate

The Radeon R9 390X 8G will be much (more or less 190%) faster with regards to full screen anti-aliasing than the Radeon R9 M395X, and will be capable of handling higher resolutions more effectively. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 44064 (190%)

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 max amount of information (measured in megabytes per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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