Radeon R5 M255 vs Radeon R9 380X

Intro

Compare those specifications to the Radeon R9 380X, which makes use of a 28 nm design. AMD has set the core speed at 970 MHz. The GDDR5 RAM runs at a frequency of 1425 MHz on this specific model. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 380X should in theory be a lot faster than the Radeon R5 M255 overall. (explain)

Radeon R9 380X		182400 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 166400 (1040%)

Texel Rate

The Radeon R9 380X will be a lot (about 560%) better at AF than the Radeon R5 M255. (explain)

Radeon R9 380X		124160 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 105360 (560%)

Pixel Rate

The Radeon R9 380X is much (approximately 313%) more effective at FSAA than the Radeon R5 M255, and also should be able to handle higher screen resolutions more effectively. (explain)

Radeon R9 380X		31040 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 23520 (313%)

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 (counted in MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 are applied per second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels 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 amount 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 outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.