Radeon HD 4750 vs Radeon R5 M255

Intro

Compare all that to the Radeon R5 M255, which features a core clock speed of 940 MHz and a DDR3 memory speed of 1000 MHz. It also makes use of a 64-bit bus, and uses a 28 nm design. It is made up of 320 SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4750 should be 220% faster than the Radeon R5 M255 in general, because of its greater data rate. (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%) more effective at anisotropic filtering than the Radeon R5 M255. (explain)

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

Pixel Rate

The Radeon HD 4750 should be a lot (about 55%) more effective at full screen anti-aliasing than the Radeon R5 M255, and also should be capable of handling higher screen resolutions without losing too much performance. (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: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the video 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 could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs 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 rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.