Radeon HD 4750 vs Radeon R5 M255

Intro

Compare those specs to the Radeon R5 M255, which makes use of a 28 nm design. AMD has clocked the core speed at 940 MHz. The DDR3 RAM works at a speed of 1000 MHz on this particular card. It features 320 SPUs along with 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 4750 should in theory be a lot better than the Radeon R5 M255 overall. (explain)

Radeon HD 4750		51200 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 35200 (220%)

Texel Rate

The Radeon HD 4750 should be quite a bit (about 24%) faster with regards to texture filtering than the Radeon R5 M255. (explain)

Radeon HD 4750		23360 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 4560 (24%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4750 is superior to the Radeon R5 M255, by a large margin. (explain)

Radeon HD 4750		11680 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 4160 (55%)

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 data (measured in MB per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.