Radeon R9 280X vs Radeon R9 M385X

Intro

Compare all that to the Radeon R9 M385X, which has core speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 RAM. It features 896 SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 280X will be 200% quicker than the Radeon R9 M385X overall, because of its higher data rate. (explain)

Radeon R9 280X		288000 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 192000 (200%)

Texel Rate

The Radeon R9 280X should be a lot (more or less 77%) better at AF than the Radeon R9 M385X. (explain)

Radeon R9 280X		108800 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 47200 (77%)

Pixel Rate

The Radeon R9 280X will be much (approximately 55%) more effective at FSAA than the Radeon R9 M385X, and capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 280X		27200 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 9600 (55%)

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 (measured in MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the 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 number of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. 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 many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.