GeForce GTX 980 vs Radeon R5 M255

Intro

Compare all of that to the Radeon R5 M255, which comes with a GPU core clock speed of 940 MHz, and 2048 MB of DDR3 RAM running at 1000 MHz through a 64-bit bus. It also features 320 Stream Processors, 20 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce GTX 980 should in theory be quite a bit superior to the Radeon R5 M255 in general. (explain)

GeForce GTX 980		224000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 208000 (1300%)

Texel Rate

The GeForce GTX 980 will be a lot (approximately 667%) faster with regards to texture filtering than the Radeon R5 M255. (explain)

GeForce GTX 980		144128 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 125328 (667%)

Pixel Rate

The GeForce GTX 980 should be much (approximately 858%) better at full screen anti-aliasing than the Radeon R5 M255, and will be able to handle higher resolutions more effectively. (explain)

GeForce GTX 980		72064 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 64544 (858%)

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 megabytes per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the 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 the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock 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 lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.