Radeon HD 4830 512MB vs Radeon R5 M255

Intro

Compare those specs to the Radeon R5 M255, which features core 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

Theoretically, the Radeon HD 4830 512MB should perform much faster than 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 (about 2%) more effective at texture 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 a high screen resolution is important to you, then the Radeon HD 4830 512MB is a better choice, by a large margin. (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: Memory bandwidth is the largest amount of information (counted in MB per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's 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 applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.