Radeon R9 M280X vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which comes with a core clock speed of 750 MHz and a GDDR5 memory speed of 1375 MHz. It also features a 256-bit bus, and uses a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X		75 Watts
Radeon R9 M295X		125 Watts
	Difference: 50 Watts (67%)

Memory Bandwidth

The Radeon R9 M295X should in theory perform a lot faster than the Radeon R9 M280X overall. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon R9 M280X		88000 MB/sec
	Difference: 88000 (100%)

Texel Rate

The Radeon R9 M295X will be a lot (about 90%) faster with regards to anisotropic filtering than the Radeon R9 M280X. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon R9 M280X		50400 Mtexels/sec
	Difference: 45600 (90%)

Pixel Rate

The Radeon R9 M295X will be quite a bit (more or less 67%) faster with regards to AA than the Radeon R9 M280X, and capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon R9 M280X		14400 Mpixels/sec
	Difference: 9600 (67%)

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 MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, 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 can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel 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 reach the max fill rate.