GeForce GTX 650 vs Radeon R5 M255

Intro

Compare those specs to the Radeon R5 M255, which has core clock 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

Performance-wise, the GeForce GTX 650 should in theory be much better than the Radeon R5 M255 overall. (explain)

GeForce GTX 650		80000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 64000 (400%)

Texel Rate

The GeForce GTX 650 is much (about 80%) better at anisotropic filtering than the Radeon R5 M255. (explain)

GeForce GTX 650		33856 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 15056 (80%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 650 is the winner, by far. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 9408 (125%)

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 (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units 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 output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.