Radeon HD 7950 3GB vs Radeon R9 M295X

Intro

Compare all that to the Radeon R9 M295X, which has a clock frequency of 750 MHz and a GDDR5 memory frequency of 1375 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 75 Watts (60%)

Memory Bandwidth

The Radeon HD 7950 3GB, in theory, should be a lot faster than the Radeon R9 M295X in general. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 64000 (36%)

Texel Rate

The Radeon R9 M295X is a small bit (more or less 7%) better at texture filtering than the Radeon HD 7950 3GB. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 7950 3GB		89600 Mtexels/sec
	Difference: 6400 (7%)

Pixel Rate

The Radeon HD 7950 3GB will be a little bit (more or less 7%) better at full screen anti-aliasing than the Radeon R9 M295X, and should be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 1600 (7%)

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 (measured in megabytes per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its 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 - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.