Radeon HD 4550 256MB vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which features GPU core 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 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R5 M255 is 25% faster than the Radeon HD 4550 256MB in general, due to its greater bandwidth. (explain)

Radeon R5 M255		16000 MB/sec
Radeon HD 4550 256MB		12800 MB/sec
	Difference: 3200 (25%)

Texel Rate

The Radeon R5 M255 is quite a bit (about 292%) faster with regards to anisotropic filtering than the Radeon HD 4550 256MB. (explain)

Radeon R5 M255		18800 Mtexels/sec
Radeon HD 4550 256MB		4800 Mtexels/sec
	Difference: 14000 (292%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R5 M255 is superior to the Radeon HD 4550 256MB, by far. (explain)

Radeon R5 M255		7520 Mpixels/sec
Radeon HD 4550 256MB		2400 Mpixels/sec
	Difference: 5120 (213%)

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 information (counted in MB per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of 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 output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.