GeForce GTX 285 1GB vs Radeon R5 M255

Intro

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 285 1GB is 894% faster than the Radeon R5 M255 overall, because of its higher data rate. (explain)

GeForce GTX 285 1GB		158976 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 142976 (894%)

Texel Rate

The GeForce GTX 285 1GB will be a lot (approximately 176%) faster with regards to anisotropic filtering than the Radeon R5 M255. (explain)

GeForce GTX 285 1GB		51840 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 33040 (176%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 285 1GB is a better choice, by a large margin. (explain)

GeForce GTX 285 1GB		20736 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 13216 (176%)

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 largest amount of data (in units of MB per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.