GeForce GTX 590 vs Radeon R5 M255

Intro

Compare all that to the Radeon R5 M255, which has clock speeds of 940 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 320 SPUs along with 20 TAUs and 8 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTX 590, in theory, should be much faster than the Radeon R5 M255 overall. (explain)

GeForce GTX 590		328320 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 312320 (1952%)

Texel Rate

The GeForce GTX 590 is quite a bit (more or less 313%) more effective at anisotropic filtering than the Radeon R5 M255. (explain)

GeForce GTX 590		77696 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 58896 (313%)

Pixel Rate

The GeForce GTX 590 is much (more or less 675%) faster with regards to full screen anti-aliasing than the Radeon R5 M255, and should be capable of handling higher screen resolutions better. (explain)

GeForce GTX 590		58272 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 50752 (675%)

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 maximum amount of data (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total number of 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 a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.