Radeon HD 7870 XT vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which uses a 28 nm design. AMD has clocked the core frequency at 723 MHz. The GDDR5 RAM is set to run at a frequency of 1250 MHz on this particular model. It features 2048 SPUs as well as 128 TAUs 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 7870 XT		185 Watts
	Difference: 60 Watts (48%)

Memory Bandwidth

The Radeon HD 7870 XT should theoretically perform a small bit faster than the Radeon R9 M395X overall. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 32000 (20%)

Texel Rate

The Radeon R9 M395X is just a bit (approximately 4%) better at texture filtering than the Radeon HD 7870 XT. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 7870 XT		88800 Mtexels/sec
	Difference: 3744 (4%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7870 XT is the winner, by a large margin. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon R9 M395X		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 max amount of data (measured in MB per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once 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 AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.