Radeon HD 7950 3GB vs Radeon R9 M395X

Intro

Compare all of that to the Radeon R9 M395X, which features core speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 75 Watts (60%)

Memory Bandwidth

The Radeon HD 7950 3GB, in theory, should be much faster than the Radeon R9 M395X in general. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 80000 (50%)

Texel Rate

The Radeon R9 M395X will be a bit (about 3%) faster with regards to texture filtering than the Radeon HD 7950 3GB. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 7950 3GB		89600 Mtexels/sec
	Difference: 2944 (3%)

Pixel Rate

The Radeon HD 7950 3GB should be a small bit (more or less 11%) more effective at full screen anti-aliasing than the Radeon R9 M395X, and also should be able to handle higher resolutions while still performing well. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 2464 (11%)

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 maximum amount of information (measured in MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs 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 rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.