Radeon R9 280X vs Radeon R9 M275X

Intro

Compare those specifications to the Radeon R9 M275X, which has a GPU core clock speed of 900 MHz, and 2048 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also is comprised of 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 280X		250 Watts
	Difference: 200 Watts (400%)

Memory Bandwidth

As far as performance goes, the Radeon R9 280X should in theory be a lot superior to the Radeon R9 M275X in general. (explain)

Radeon R9 280X		288000 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 216000 (300%)

Texel Rate

The Radeon R9 280X is a lot (more or less 202%) more effective at anisotropic filtering than the Radeon R9 M275X. (explain)

Radeon R9 280X		108800 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 72800 (202%)

Pixel Rate

The Radeon R9 280X should be much (about 89%) faster with regards to full screen anti-aliasing than the Radeon R9 M275X, and will be capable of handling higher screen resolutions better. (explain)

Radeon R9 280X		27200 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 12800 (89%)

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 (in units of megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If 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 number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in a 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 - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.