GeForce GTX 980 Ti vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which has GPU core speed of 940 MHz, and 2048 MB of DDR3 memory set to run at 1000 MHz through a 64-bit bus. It also is made up of 320 Stream Processors, 20 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the GeForce GTX 980 Ti should perform a lot faster than the Radeon R5 M255 in general. (explain)

GeForce GTX 980 Ti		336000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 320000 (2000%)

Texel Rate

The GeForce GTX 980 Ti will be a lot (approximately 836%) more effective at AF than the Radeon R5 M255. (explain)

GeForce GTX 980 Ti		176000 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 157200 (836%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 980 Ti is a better choice, by far. (explain)

GeForce GTX 980 Ti		96000 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 88480 (1177%)

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 data (counted in megabytes per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics 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 most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.