Radeon HD 7850 vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which comes with core clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs along with 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 be just a bit faster than the Radeon HD 7850 in general. (explain)

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

Texel Rate

The Radeon R9 M395X should be quite a bit (more or less 68%) faster with regards to 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 should be a bit (about 19%) better at AA than the Radeon R9 M395X, and also able to handle higher screen resolutions more effectively. (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: Bandwidth is the largest amount of information (counted in MB per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 maximum number of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.