Radeon R9 280X vs Radeon R9 M295X

Intro

Compare those specifications to the Radeon R9 M295X, which has a core clock frequency of 750 MHz and a GDDR5 memory frequency of 1375 MHz. It also makes use of a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon R9 280X		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

Performance-wise, the Radeon R9 280X should in theory be a lot superior to the Radeon R9 M295X overall. (explain)

Radeon R9 280X		288000 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 112000 (64%)

Texel Rate

The Radeon R9 280X should be a little bit (more or less 13%) faster with regards to anisotropic filtering than the Radeon R9 M295X. (explain)

Radeon R9 280X		108800 Mtexels/sec
Radeon R9 M295X		96000 Mtexels/sec
	Difference: 12800 (13%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 280X is superior to the Radeon R9 M295X, though only just barely. (explain)

Radeon R9 280X		27200 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 3200 (13%)

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 maximum amount of information (counted in MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 texture map elements (texels) that are applied in one second. This is calculated by multiplying the total amount of texture units of the card by the core 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could 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 Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.