Radeon R9 280X vs Radeon R9 M395X

Intro

Compare those specs to the Radeon R9 M395X, which makes use of a 28 nm design. AMD has set the core speed at 723 MHz. The GDDR5 memory works at a frequency of 1250 MHz on this model. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon R9 280X		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

Performance-wise, the Radeon R9 280X should theoretically be much better than the Radeon R9 M395X in general. (explain)

Radeon R9 280X		288000 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 128000 (80%)

Texel Rate

The Radeon R9 280X is a small bit (about 18%) better at AF than the Radeon R9 M395X. (explain)

Radeon R9 280X		108800 Mtexels/sec
Radeon R9 M395X		92544 Mtexels/sec
	Difference: 16256 (18%)

Pixel Rate

The Radeon R9 280X will be a bit (more or less 18%) better at AA than the Radeon R9 M395X, and will be capable of handling higher screen resolutions better. (explain)

Radeon R9 280X		27200 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 4064 (18%)

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 information (counted in megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.