GeForce GTX 980M vs Radeon R9 M395X

Intro

Compare those specs to the Radeon R9 M395X, which makes use of a 28 nm design. AMD has set the core speed at 723 MHz. The GDDR5 memory works at a frequency of 1250 MHz on this specific model. 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)

GeForce GTX 980M		100 Watts
Radeon R9 M395X		125 Watts
	Difference: 25 Watts (25%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M395X should perform a lot faster than the GeForce GTX 980M in general. (explain)

Radeon R9 M395X		160000 MB/sec
GeForce GTX 980M		128000 MB/sec
	Difference: 32000 (25%)

Texel Rate

The GeForce GTX 980M will be a little bit (about 8%) more effective at AF than the Radeon R9 M395X. (explain)

GeForce GTX 980M		99648 Mtexels/sec
Radeon R9 M395X		92544 Mtexels/sec
	Difference: 7104 (8%)

Pixel Rate

The GeForce GTX 980M will be much (more or less 187%) better at full screen anti-aliasing than the Radeon R9 M395X, and able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 980M		66432 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 43296 (187%)

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 (measured in MB per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, 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 that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.