Radeon R9 380 4G vs Radeon R9 M380

Intro

Compare those specifications to the Radeon R9 M380, which comes with a core clock frequency of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It 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

As far as performance goes, the Radeon R9 380 4G should in theory be quite a bit better than the Radeon R9 M380 in general. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon R9 M380		96000 MB/sec
	Difference: 86400 (90%)

Texel Rate

The Radeon R9 380 4G is a lot (more or less 172%) more effective at texture filtering than the Radeon R9 M380. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon R9 M380		40000 Mtexels/sec
	Difference: 68640 (172%)

Pixel Rate

The Radeon R9 380 4G is a lot (about 94%) more effective at full screen anti-aliasing than the Radeon R9 M380, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 380 4G		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 max amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.