Radeon R9 380 4G vs Radeon R9 M280X

Intro

Compare all that to the Radeon R9 M280X, which features a core clock speed of 900 MHz and a GDDR5 memory frequency of 1375 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is comprised of 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X		75 Watts
Radeon R9 380 4G		190 Watts
	Difference: 115 Watts (153%)

Memory Bandwidth

In theory, the Radeon R9 380 4G is 107% quicker than the Radeon R9 M280X in general, due to its higher data rate. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon R9 M280X		88000 MB/sec
	Difference: 94400 (107%)

Texel Rate

The Radeon R9 380 4G should be much (more or less 116%) better at texture filtering than the Radeon R9 M280X. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon R9 M280X		50400 Mtexels/sec
	Difference: 58240 (116%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 380 4G is the winner, and very much so. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon R9 M280X		14400 Mpixels/sec
	Difference: 16640 (116%)

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 (counted in megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 amount of texture map elements (texels) that are processed per 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 this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. 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 output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.