GeForce GTX 780 Ti vs Radeon R5 M255

Intro

Compare all that to the Radeon R5 M255, which uses a 28 nm design. AMD has clocked the core speed at 940 MHz. The DDR3 RAM works at a speed of 1000 MHz on this particular model. It features 320 SPUs as well as 20 TAUs and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce GTX 780 Ti will be 2000% faster than the Radeon R5 M255 overall, due to its higher data rate. (explain)

GeForce GTX 780 Ti		336000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 320000 (2000%)

Texel Rate

The GeForce GTX 780 Ti should be a lot (more or less 1017%) more effective at texture filtering than the Radeon R5 M255. (explain)

GeForce GTX 780 Ti		210000 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 191200 (1017%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 780 Ti is a better choice, by a large margin. (explain)

GeForce GTX 780 Ti		42000 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 34480 (459%)

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 information (in units of megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends 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.