Radeon HD 7950 vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which has core clock speeds of 750 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs along with 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		200 Watts
	Difference: 75 Watts (60%)

Memory Bandwidth

In theory, the Radeon HD 7950 should be 36% faster than the Radeon R9 M295X overall, due to its greater data rate. (explain)

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

Texel Rate

The Radeon R9 M295X should be a small bit (more or less 7%) faster with regards to texture filtering than the Radeon HD 7950. (explain)

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

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7950 is the winner, but it probably won't make a huge difference. (explain)

Radeon HD 7950		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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.