Radeon HD 7850 vs Radeon R9 M395X

Intro

Compare all of that to the Radeon R9 M395X, which comes with a core clock frequency of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 256-bit bus, and uses a 28 nm design. It is made up 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 M395X		125 Watts
Radeon HD 7850		130 Watts
	Difference: 5 Watts (4%)

Memory Bandwidth

The Radeon R9 M395X should theoretically perform a little bit faster than the Radeon HD 7850 overall. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 7850		153600 MB/sec
	Difference: 6400 (4%)

Texel Rate

The Radeon R9 M395X will be quite a bit (about 68%) better at texture filtering than the Radeon HD 7850. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 7850		55040 Mtexels/sec
	Difference: 37504 (68%)

Pixel Rate

The Radeon HD 7850 will be a little bit (approximately 19%) more effective at AA than the Radeon R9 M395X, and should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon R9 M395X		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: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output 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 get to the max fill rate.