Radeon R9 270X vs Radeon R9 M280X

Intro

Compare those specifications to the Radeon R9 M280X, which comes with a clock speed of 900 MHz and a GDDR5 memory frequency of 1375 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It features 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 270X		180 Watts
	Difference: 105 Watts (140%)

Memory Bandwidth

Theoretically, the Radeon R9 270X should be much faster than the Radeon R9 M280X overall. (explain)

Radeon R9 270X		179200 MB/sec
Radeon R9 M280X		88000 MB/sec
	Difference: 91200 (104%)

Texel Rate

The Radeon R9 270X should be a lot (more or less 59%) more effective at anisotropic filtering than the Radeon R9 M280X. (explain)

Radeon R9 270X		80000 Mtexels/sec
Radeon R9 M280X		50400 Mtexels/sec
	Difference: 29600 (59%)

Pixel Rate

The Radeon R9 270X will be much (more or less 122%) better at AA than the Radeon R9 M280X, and capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 270X		32000 Mpixels/sec
Radeon R9 M280X		14400 Mpixels/sec
	Difference: 17600 (122%)

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 data (in units of MB per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, 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 figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the 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 the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. 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 rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.