Radeon HD 4830 1GB vs Radeon R5 M255

Intro

Compare those specs to the Radeon R5 M255, which has GPU clock speed of 940 MHz, and 2048 MB of DDR3 memory set to run 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

Performance-wise, the Radeon HD 4830 1GB should in theory be a lot better than the Radeon R5 M255 in general. (explain)

Radeon HD 4830 1GB		57600 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 41600 (260%)

Texel Rate

The Radeon R5 M255 is a small bit (about 2%) faster with regards to AF than the Radeon HD 4830 1GB. (explain)

Radeon R5 M255		18800 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 400 (2%)

Pixel Rate

The Radeon HD 4830 1GB will be quite a bit (more or less 22%) faster with regards to AA than the Radeon R5 M255, and also will be capable of handling higher screen resolutions better. (explain)

Radeon HD 4830 1GB		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 largest amount of data (in units of MB per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, 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 maximum amount of pixels the graphics card could possibly record to its local memory per 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 - aka Render Output Units) are responsible for filling the screen with pixels (the image). 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.