Radeon R9 270X vs Radeon R9 M390X

Intro

Compare that to the Radeon R9 M390X, which features a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 RAM running 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 M390X		125 Watts
Radeon R9 270X		180 Watts
	Difference: 55 Watts (44%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 270X will be 12% quicker than the Radeon R9 M390X in general, due to its higher bandwidth. (explain)

Radeon R9 270X		179200 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 19200 (12%)

Texel Rate

The Radeon R9 M390X should be a bit (about 16%) better at AF than the Radeon R9 270X. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon R9 270X		80000 Mtexels/sec
	Difference: 12544 (16%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 270X is the winner, by far. (explain)

Radeon R9 270X		32000 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 8864 (38%)

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: Bandwidth is the maximum amount of data (counted in MB per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at 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 graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.