Radeon R9 380 2G vs Radeon R9 M385X

Intro

Compare all of that to the Radeon R9 M385X, which features GPU core speed of 1100 MHz, and 4096 MB of GDDR5 RAM running at 1500 MHz through a 128-bit bus. It also is made up of 896 Stream Processors, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 380 2G should be 90% quicker than the Radeon R9 M385X overall, due to its greater data rate. (explain)

Radeon R9 380 2G		182400 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 86400 (90%)

Texel Rate

The Radeon R9 380 2G is quite a bit (approximately 76%) faster with regards to texture filtering than the Radeon R9 M385X. (explain)

Radeon R9 380 2G		108640 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 47040 (76%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 380 2G is superior to the Radeon R9 M385X, and very much so. (explain)

Radeon R9 380 2G		31040 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 13440 (76%)

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 data (counted in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. 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 fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.