Radeon HD 7850 vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which has core clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Radeon HD 7850		130 Watts
	Difference: 5 Watts (4%)

Memory Bandwidth

In theory, the Radeon R9 M390X will be 4% faster than the Radeon HD 7850 in general, because of its higher bandwidth. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 7850		153600 MB/sec
	Difference: 6400 (4%)

Texel Rate

The Radeon R9 M390X will be quite a bit (more or less 68%) more effective at texture filtering than the Radeon HD 7850. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 7850		55040 Mtexels/sec
	Difference: 37504 (68%)

Pixel Rate

The Radeon HD 7850 will be just a bit (approximately 19%) more effective at anti-aliasing than the Radeon R9 M390X, and able to handle higher screen resolutions better. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 4384 (19%)

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 (counted in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 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 processed in one second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.