Radeon R9 270X vs Radeon R9 M275X

Intro

Compare those specs to the Radeon R9 M275X, which has a clock frequency of 900 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It features 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon R9 270X		180 Watts
	Difference: 130 Watts (260%)

Memory Bandwidth

Theoretically, the Radeon R9 270X should perform much faster than the Radeon R9 M275X overall. (explain)

Radeon R9 270X		179200 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 107200 (149%)

Texel Rate

The Radeon R9 270X should be a lot (approximately 122%) better at AF than the Radeon R9 M275X. (explain)

Radeon R9 270X		80000 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 44000 (122%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 270X is a better choice, by far. (explain)

Radeon R9 270X		32000 Mpixels/sec
Radeon R9 M275X		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 max amount of information (counted in megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen 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 of the card by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.