Radeon HD 4830 512MB vs Radeon R5 M255

Intro

Compare that to the Radeon R5 M255, which has core clock speeds of 940 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 320 SPUs as well as 20 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 4830 512MB should in theory be a lot superior to the Radeon R5 M255 in general. (explain)

Radeon HD 4830 512MB		57600 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 41600 (260%)

Texel Rate

The Radeon R5 M255 is just a bit (approximately 2%) better at anisotropic filtering than the Radeon HD 4830 512MB. (explain)

Radeon R5 M255		18800 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 400 (2%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4830 512MB is the winner, and very much so. (explain)

Radeon HD 4830 512MB		9200 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 1680 (22%)

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 max amount of information (counted in MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.