GeForce GTX 980M vs Radeon R9 M375X

Intro

Compare all of that to the Radeon R9 M375X, which features core clock speeds of 1015 MHz on the GPU, and 1125 MHz on the 4096 MB of GDDR5 memory. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980M is 78% faster than the Radeon R9 M375X overall, because of its greater data rate. (explain)

GeForce GTX 980M		128000 MB/sec
Radeon R9 M375X		72000 MB/sec
	Difference: 56000 (78%)

Texel Rate

The GeForce GTX 980M should be quite a bit (about 145%) better at texture filtering than the Radeon R9 M375X. (explain)

GeForce GTX 980M		99648 Mtexels/sec
Radeon R9 M375X		40600 Mtexels/sec
	Difference: 59048 (145%)

Pixel Rate

The GeForce GTX 980M will be much (more or less 309%) more effective at FSAA than the Radeon R9 M375X, and also able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 980M		66432 Mpixels/sec
Radeon R9 M375X		16240 Mpixels/sec
	Difference: 50192 (309%)

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 megabytes per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.