GeForce GTX 980M vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which has a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also features 2048 SPUs, 128 TAUs, 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, the Radeon R9 M395X should perform quite a bit 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 bit (approximately 8%) faster with regards to anisotropic filtering 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 is quite a bit (approximately 187%) more effective at FSAA than the Radeon R9 M395X, and also should be 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 max amount of data (measured in MB per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total amount of texture units of the card 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.