GeForce GTX 285 1GB vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which features core speeds of 940 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. 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, the GeForce GTX 285 1GB should be quite a bit faster than the Radeon R5 M255 overall. (explain)

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

Texel Rate

The GeForce GTX 285 1GB is much (more or less 176%) better at texture 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

The GeForce GTX 285 1GB will be a lot (about 176%) better at anti-aliasing than the Radeon R5 M255, and capable of handling higher screen resolutions while still performing well. (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 max amount of data (counted in megabytes per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units of the card 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.