GeForce GT 240 GDDR5 vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which has 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

In theory, the GeForce GT 240 GDDR5 will be 240% faster than the Radeon R5 M255 in general, due to its higher bandwidth. (explain)

GeForce GT 240 GDDR5		54400 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 38400 (240%)

Texel Rate

The Radeon R5 M255 is a bit (more or less 7%) more effective at anisotropic filtering than the GeForce GT 240 GDDR5. (explain)

Radeon R5 M255		18800 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 1200 (7%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R5 M255 is superior to the GeForce GT 240 GDDR5, and very much so. (explain)

Radeon R5 M255		7520 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 3120 (71%)

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: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs 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 rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.