Radeon R5 M255 vs Radeon R5 M330

Intro

Compare those specs to the Radeon R5 M330, which comes with a core clock speed of 1030 MHz and a DDR3 memory speed of 900 MHz. It also features a 64-bit memory bus, and uses a 28 nm design. It is comprised of 320 SPUs, 20 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon R5 M255 should be a small bit faster than the Radeon R5 M330 in general. (explain)

Radeon R5 M255		16000 MB/sec
Radeon R5 M330		14400 MB/sec
	Difference: 1600 (11%)

Texel Rate

The Radeon R5 M330 is a bit (about 10%) faster with regards to AF than the Radeon R5 M255. (explain)

Radeon R5 M330		20600 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 1800 (10%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R5 M330 is superior to the Radeon R5 M255, but only just. (explain)

Radeon R5 M330		8240 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 720 (10%)

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

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