Radeon R5 M255 vs Radeon R9 390X 8G

Intro

Compare all that to the Radeon R9 390X 8G, which makes use of a 28 nm design. AMD has clocked the core speed at 1050 MHz. The GDDR5 RAM works at a speed of 1500 MHz on this particular model. It features 2816 SPUs as well as 176 Texture Address Units and 64 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 390X 8G should in theory be a lot faster than the Radeon R5 M255 overall. (explain)

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

Texel Rate

The Radeon R9 390X 8G will be quite a bit (about 883%) faster with regards to anisotropic filtering than the Radeon R5 M255. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 166000 (883%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 390X 8G is superior to the Radeon R5 M255, by a large margin. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 59680 (794%)

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 megabytes per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total number of texture units of the card 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.