Radeon R5 M255 vs Radeon R9 390 8G

Intro

Compare all of that to the Radeon R9 390 8G, which comes with a core clock frequency of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 512-bit bus, and uses a 28 nm design. It is made up of 2560 SPUs, 160 Texture Address Units, and 64 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 390 8G should perform quite a bit faster than the Radeon R5 M255 overall. (explain)

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

Texel Rate

The Radeon R9 390 8G should be a lot (approximately 751%) better at anisotropic 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

If running with a high resolution is important to you, then the Radeon R9 390 8G is the winner, by a large margin. (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 information (measured in megabytes per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units of the card by the core clock 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends 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.