Radeon HD 5830 vs Radeon R5 M255

Intro

Compare that to the Radeon R5 M255, which features GPU clock speed of 940 MHz, and 2048 MB of DDR3 RAM set to run 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 HD 5830 should be 700% quicker than the Radeon R5 M255 overall, because of its greater bandwidth. (explain)

Radeon HD 5830		128000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 112000 (700%)

Texel Rate

The Radeon HD 5830 will be a lot (approximately 138%) more effective at texture filtering than the Radeon R5 M255. (explain)

Radeon HD 5830		44800 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 26000 (138%)

Pixel Rate

The Radeon HD 5830 will be quite a bit (approximately 70%) more effective at AA than the Radeon R5 M255, and able to handle higher resolutions while still performing well. (explain)

Radeon HD 5830		12800 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 5280 (70%)

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 maximum amount of data (counted in MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.