Radeon R5 M255 vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which has a core clock frequency of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 512-bit memory bus, and uses a 28 nm design. It is comprised of 2560 SPUs, 160 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 390 8G should be 2300% quicker than the Radeon R5 M255 in general, because of its higher data rate. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 368000 (2300%)

Texel Rate

The Radeon R9 390 8G will be much (approximately 751%) better at texture filtering than the Radeon R5 M255. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 141200 (751%)

Pixel Rate

The Radeon R9 390 8G should be quite a bit (approximately 751%) better at FSAA than the Radeon R5 M255, and also will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 56480 (751%)

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 transported across the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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