Radeon R9 380 4G vs Radeon R9 M385X

Intro

Compare those specs to the Radeon R9 M385X, which has a clock speed of 1100 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It is comprised of 896 SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon R9 380 4G should in theory be quite a bit better than the Radeon R9 M385X overall. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 86400 (90%)

Texel Rate

The Radeon R9 380 4G will be a lot (approximately 76%) faster with regards to AF than the Radeon R9 M385X. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 47040 (76%)

Pixel Rate

The Radeon R9 380 4G is much (approximately 76%) faster with regards to AA than the Radeon R9 M385X, and also able to handle higher resolutions more effectively. (explain)

Radeon R9 380 4G		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: Bandwidth is the largest amount of information (in units of MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total texture units of the card 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 applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.