Radeon R9 380X vs Radeon R9 M380

Intro

Compare those specifications to the Radeon R9 M380, which has a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon R9 380X should theoretically be much superior to the Radeon R9 M380 in general. (explain)

Radeon R9 380X		182400 MB/sec
Radeon R9 M380		96000 MB/sec
	Difference: 86400 (90%)

Texel Rate

The Radeon R9 380X will be quite a bit (about 210%) better at AF than the Radeon R9 M380. (explain)

Radeon R9 380X		124160 Mtexels/sec
Radeon R9 M380		40000 Mtexels/sec
	Difference: 84160 (210%)

Pixel Rate

The Radeon R9 380X is quite a bit (approximately 94%) more effective at anti-aliasing than the Radeon R9 M380, and should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 380X		31040 Mpixels/sec
Radeon R9 M380		16000 Mpixels/sec
	Difference: 15040 (94%)

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 information (measured in megabytes per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units of the card 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 one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can 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 Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.