GeForce GTX 880M vs Radeon R9 M395X

Intro

Compare all of that 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 as well as 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
GeForce GTX 880M		130 Watts
	Difference: 5 Watts (4%)

Memory Bandwidth

The Radeon R9 M395X should in theory be much faster than the GeForce GTX 880M in general. (explain)

Radeon R9 M395X		160000 MB/sec
GeForce GTX 880M		128000 MB/sec
	Difference: 32000 (25%)

Texel Rate

The GeForce GTX 880M will be quite a bit (approximately 32%) better at texture filtering than the Radeon R9 M395X. (explain)

GeForce GTX 880M		122112 Mtexels/sec
Radeon R9 M395X		92544 Mtexels/sec
	Difference: 29568 (32%)

Pixel Rate

The GeForce GTX 880M will be much (more or less 32%) better at AA than the Radeon R9 M395X, and able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 880M		30528 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 7392 (32%)

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 (counted in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at 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 the video card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the card's 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 rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.