Radeon R9 380 4G vs Radeon R9 M385X

Intro

Compare that to the Radeon R9 M385X, which makes use of a 28 nm design. AMD has set the core frequency at 1100 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this specific card. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 380 4G will be 90% faster than the Radeon R9 M385X overall, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon R9 380 4G is much (approximately 76%) more effective at 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 (more or less 76%) more effective at FSAA than the Radeon R9 M385X, and should be able to handle higher resolutions better. (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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total number of texture units of the card 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 in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.