GeForce GTX 970 vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which makes use of a 28 nm design. AMD has set the core speed at 940 MHz. The DDR3 RAM works at a frequency of 1000 MHz on this particular model. It features 320 SPUs along with 20 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 970 will be 1300% faster than the Radeon R5 M255 in general, due to its higher bandwidth. (explain)

GeForce GTX 970		224000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 208000 (1300%)

Texel Rate

The GeForce GTX 970 will be quite a bit (approximately 481%) better at anisotropic filtering than the Radeon R5 M255. (explain)

GeForce GTX 970		109200 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 90400 (481%)

Pixel Rate

The GeForce GTX 970 will be a lot (more or less 794%) faster with regards to AA than the Radeon R5 M255, and able to handle higher screen resolutions better. (explain)

GeForce GTX 970		67200 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 59680 (794%)

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 MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the 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 per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.