Radeon HD 7950 vs Radeon R9 M295X

Intro

Compare all that 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 memory. It features 2048 SPUs along with 128 Texture Address Units 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

Theoretically speaking, the Radeon HD 7950 should be 36% faster than the Radeon R9 M295X overall, because of 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 little bit (approximately 7%) more effective at AF than the Radeon HD 7950. (explain)

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

Pixel Rate

If using 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 max amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.