Radeon R9 270X vs Radeon R9 M295X

Intro

Compare all of that to the Radeon R9 M295X, which features a clock frequency of 750 MHz and a GDDR5 memory speed of 1375 MHz. It also uses a 256-bit 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 270X		180 Watts
	Difference: 55 Watts (44%)

Memory Bandwidth

Performance-wise, the Radeon R9 270X should in theory be a small bit superior to the Radeon R9 M295X overall. (explain)

Radeon R9 270X		179200 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 3200 (2%)

Texel Rate

The Radeon R9 M295X will be a bit (more or less 20%) faster with regards to AF than the Radeon R9 270X. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon R9 270X		80000 Mtexels/sec
	Difference: 16000 (20%)

Pixel Rate

The Radeon R9 270X will be much (about 33%) better at AA than the Radeon R9 M295X, and also should be capable of handling higher resolutions more effectively. (explain)

Radeon R9 270X		32000 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 8000 (33%)

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 megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.