Radeon HD 7950 vs Radeon R9 M275X

Intro

Compare all of that to the Radeon R9 M275X, which features GPU clock speed of 900 MHz, and 2048 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon HD 7950		200 Watts
	Difference: 150 Watts (300%)

Memory Bandwidth

The Radeon HD 7950, in theory, should be much faster than the Radeon R9 M275X overall. (explain)

Radeon HD 7950		240000 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 168000 (233%)

Texel Rate

The Radeon HD 7950 should be quite a bit (about 149%) more effective at texture filtering than the Radeon R9 M275X. (explain)

Radeon HD 7950		89600 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 53600 (149%)

Pixel Rate

The Radeon HD 7950 is quite a bit (approximately 78%) more effective at FSAA than the Radeon R9 M275X, and will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 7950		25600 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 11200 (78%)

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 largest amount of information (in units of megabytes per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 processed per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. 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 lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.