Radeon HD 5550 vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which has GPU clock speed of 940 MHz, and 2048 MB of DDR3 RAM running at 1000 MHz through a 64-bit bus. It also is made up of 320 Stream Processors, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R5 M255 should in theory perform much faster than the Radeon HD 5550 in general. (explain)

Radeon R5 M255		16000 MB/sec
Radeon HD 5550		12800 MB/sec
	Difference: 3200 (25%)

Texel Rate

The Radeon R5 M255 will be a lot (about 114%) better at texture filtering than the Radeon HD 5550. (explain)

Radeon R5 M255		18800 Mtexels/sec
Radeon HD 5550		8800 Mtexels/sec
	Difference: 10000 (114%)

Pixel Rate

The Radeon R5 M255 should be a lot (about 71%) faster with regards to full screen anti-aliasing than the Radeon HD 5550, and also should be able to handle higher resolutions better. (explain)

Radeon R5 M255		7520 Mpixels/sec
Radeon HD 5550		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 data (counted in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it must 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 anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at 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 record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock speed of the card. 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 quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.