Geforce GTX 680 vs Radeon R5 M255

Intro

Compare all that to the Radeon R5 M255, which comes with a clock speed of 940 MHz and a DDR3 memory speed of 1000 MHz. It also uses a 64-bit memory bus, and makes use of a 28 nm design. It features 320 SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Geforce GTX 680 should be 1102% faster than the Radeon R5 M255 in general, because of its greater bandwidth. (explain)

Geforce GTX 680		192256 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 176256 (1102%)

Texel Rate

The Geforce GTX 680 will be much (about 585%) better at texture filtering than the Radeon R5 M255. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 109968 (585%)

Pixel Rate

If running with a high resolution is important to you, then the Geforce GTX 680 is superior to the Radeon R5 M255, and very much so. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 24672 (328%)

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 maximum amount of information (counted in megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 can be applied in one second. This figure is calculated by multiplying the total amount of texture units 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 per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.