GeForce GTX 980M vs Radeon R9 M280X

Intro

Compare all of that to the Radeon R9 M280X, which makes use of a 28 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 memory works at a speed of 1375 MHz on this particular model. It features 896 SPUs along with 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X		75 Watts
GeForce GTX 980M		100 Watts
	Difference: 25 Watts (33%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980M should perform much faster than the Radeon R9 M280X in general. (explain)

GeForce GTX 980M		128000 MB/sec
Radeon R9 M280X		88000 MB/sec
	Difference: 40000 (45%)

Texel Rate

The GeForce GTX 980M is a lot (more or less 98%) better at texture filtering than the Radeon R9 M280X. (explain)

GeForce GTX 980M		99648 Mtexels/sec
Radeon R9 M280X		50400 Mtexels/sec
	Difference: 49248 (98%)

Pixel Rate

The GeForce GTX 980M is a lot (more or less 361%) faster with regards to full screen anti-aliasing than the Radeon R9 M280X, and also capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 980M		66432 Mpixels/sec
Radeon R9 M280X		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: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. 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 amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.