Radeon HD 7950 vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which has GPU core speed of 723 MHz, and 4096 MB of GDDR5 memory set to run at 1250 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Radeon HD 7950		200 Watts
	Difference: 75 Watts (60%)

Memory Bandwidth

Theoretically, the Radeon HD 7950 should perform much faster than the Radeon R9 M390X in general. (explain)

Radeon HD 7950		240000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 80000 (50%)

Texel Rate

The Radeon R9 M390X will be just a bit (approximately 3%) better at anisotropic filtering than the Radeon HD 7950. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 7950		89600 Mtexels/sec
	Difference: 2944 (3%)

Pixel Rate

The Radeon HD 7950 will be a little bit (approximately 11%) faster with regards to full screen anti-aliasing than the Radeon R9 M390X, and will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 7950		25600 Mpixels/sec
Radeon R9 M390X		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 max amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's 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 also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.