Radeon R9 390 8G vs Radeon R9 M270X

Intro

Compare those specs to the Radeon R9 M270X, which comes with a GPU core clock speed of 725 MHz, and 2048 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 390 8G should perform quite a bit faster than the Radeon R9 M270X overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 312000 (433%)

Texel Rate

The Radeon R9 390 8G is quite a bit (more or less 452%) better at texture filtering than the Radeon R9 M270X. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 131000 (452%)

Pixel Rate

The Radeon R9 390 8G will be a lot (more or less 452%) more effective at anti-aliasing than the Radeon R9 M270X, and also will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 52400 (452%)

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 maximum amount of data (measured in megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. 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 anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. 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 rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.