GeForce GTX 780 Ti vs Radeon R5 M255

Intro

Compare those specs to the Radeon R5 M255, which comes with a clock frequency of 940 MHz and a DDR3 memory frequency of 1000 MHz. It also features a 64-bit bus, and uses a 28 nm design. It features 320 SPUs, 20 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce GTX 780 Ti should be quite a bit faster than the Radeon R5 M255 overall. (explain)

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

Texel Rate

The GeForce GTX 780 Ti will be a lot (more or less 1017%) faster with regards to anisotropic 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 superior to the Radeon R5 M255, 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 (measured in MB per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount of 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.