GeForce GTX 880M vs Radeon R9 M270X

Intro

Compare all of that to the Radeon R9 M270X, which has a GPU core clock speed of 725 MHz, and 2048 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce GTX 880M should in theory be quite a bit superior to the Radeon R9 M270X overall. (explain)

GeForce GTX 880M		128000 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 56000 (78%)

Texel Rate

The GeForce GTX 880M should be a lot (approximately 321%) more effective at anisotropic filtering than the Radeon R9 M270X. (explain)

GeForce GTX 880M		122112 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 93112 (321%)

Pixel Rate

The GeForce GTX 880M will be a lot (more or less 163%) better at AA than the Radeon R9 M270X, and will be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 880M		30528 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 18928 (163%)

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 information (in units of megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.