Radeon R5 M255 vs Radeon R9 M375

Intro

Compare those specs to the Radeon R9 M375, which makes use of a 28 nm design. AMD has clocked the core speed at 1015 MHz. The DDR3 RAM runs at a speed of 1100 MHz on this specific model. It features 640 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon R9 M375 should in theory be much better than the Radeon R5 M255 overall. (explain)

Radeon R9 M375		35200 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 19200 (120%)

Texel Rate

The Radeon R9 M375 will be a lot (approximately 116%) faster with regards to texture filtering than the Radeon R5 M255. (explain)

Radeon R9 M375		40600 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 21800 (116%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 M375 is a better choice, by far. (explain)

Radeon R9 M375		16240 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 8720 (116%)

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 largest amount of information (counted in megabytes per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.