Geforce GTX 690 vs Radeon R5 M255

Intro

Compare all of that to the Radeon R5 M255, which comes with GPU clock speed of 940 MHz, and 2048 MB of DDR3 RAM running at 1000 MHz through a 64-bit bus. It also features 320 SPUs, 20 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Geforce GTX 690 should theoretically perform quite a bit faster than the Radeon R5 M255 overall. (explain)

Geforce GTX 690		384512 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 368512 (2303%)

Texel Rate

The Geforce GTX 690 should be a lot (approximately 1146%) faster with regards to AF than the Radeon R5 M255. (explain)

Geforce GTX 690		234240 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 215440 (1146%)

Pixel Rate

The Geforce GTX 690 is quite a bit (more or less 679%) faster with regards to AA than the Radeon R5 M255, and able to handle higher resolutions more effectively. (explain)

Geforce GTX 690		58560 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 51040 (679%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.