Radeon R5 M255 vs Radeon R9 M275X

Intro

Compare those specifications to the Radeon R9 M275X, which uses a 28 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 memory works at a frequency of 1125 MHz on this particular 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

The Radeon R9 M275X should in theory perform quite a bit faster than the Radeon R5 M255 in general. (explain)

Radeon R9 M275X		72000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 56000 (350%)

Texel Rate

The Radeon R9 M275X should be a lot (approximately 91%) faster with regards to texture filtering than the Radeon R5 M255. (explain)

Radeon R9 M275X		36000 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 17200 (91%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 M275X is superior to the Radeon R5 M255, by far. (explain)

Radeon R9 M275X		14400 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 6880 (91%)

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 maximum amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's 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 amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure 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 filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.