GeForce GTX 980M vs Radeon R9 M275X

Intro

Compare those specifications to the Radeon R9 M275X, which uses a 28 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM works at a frequency of 1125 MHz on this model. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
GeForce GTX 980M		100 Watts
	Difference: 50 Watts (100%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980M should be 78% quicker than the Radeon R9 M275X in general, due to its greater data rate. (explain)

GeForce GTX 980M		128000 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 56000 (78%)

Texel Rate

The GeForce GTX 980M will be quite a bit (more or less 177%) more effective at texture filtering than the Radeon R9 M275X. (explain)

GeForce GTX 980M		99648 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 63648 (177%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 980M is superior to the Radeon R9 M275X, by far. (explain)

GeForce GTX 980M		66432 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 52032 (361%)

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: Bandwidth is the max amount of information (in units of megabytes per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, 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 the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs 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 output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.