Radeon R9 380X vs Radeon R9 M380

Intro

Compare all that to the Radeon R9 M380, which has a GPU core clock speed of 1000 MHz, and 4096 MB of GDDR5 memory set to run at 1500 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 380X should be a lot faster than 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 should be quite a bit (about 210%) more effective at texture filtering 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 will be much (about 94%) better at AA than the Radeon R9 M380, and also capable of handling higher resolutions without losing too much performance. (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: Memory bandwidth is the max amount of information (counted in MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, the result 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, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its 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 card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.