Radeon HD 7970 vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which comes with GPU core speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Radeon HD 7970		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7970 should perform a lot faster than the Radeon R9 M390X in general. (explain)

Radeon HD 7970		264000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 104000 (65%)

Texel Rate

The Radeon HD 7970 should be a lot (more or less 28%) better at texture filtering than the Radeon R9 M390X. (explain)

Radeon HD 7970		118400 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 25856 (28%)

Pixel Rate

The Radeon HD 7970 should be a lot (more or less 28%) more effective at full screen anti-aliasing than the Radeon R9 M390X, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7970		29600 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 6464 (28%)

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 largest amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 amount of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.