Radeon HD 7950 vs Radeon R5 M255

Intro

Compare that to the Radeon R5 M255, which uses a 28 nm design. AMD has clocked the core frequency at 940 MHz. The DDR3 RAM is set to run at a speed of 1000 MHz on this specific model. It features 320 SPUs as well as 20 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 7950 is 1400% faster than the Radeon R5 M255 overall, because of its greater data rate. (explain)

Radeon HD 7950		240000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 224000 (1400%)

Texel Rate

The Radeon HD 7950 will be much (approximately 377%) more effective at texture filtering than the Radeon R5 M255. (explain)

Radeon HD 7950		89600 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 70800 (377%)

Pixel Rate

The Radeon HD 7950 will be much (approximately 240%) more effective at FSAA than the Radeon R5 M255, and also should be able to handle higher resolutions better. (explain)

Radeon HD 7950		25600 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 18080 (240%)

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 (measured in megabytes per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs 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 rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.