Radeon R5 M255 vs Radeon R9 380 4G

Intro

Compare all of that to the Radeon R9 380 4G, which comes with core speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 memory. It features 1792 SPUs along with 112 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 380 4G will be 1040% quicker than the Radeon R5 M255 in general, due to its higher data rate. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 166400 (1040%)

Texel Rate

The Radeon R9 380 4G will be a lot (more or less 478%) more effective at AF than the Radeon R5 M255. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 89840 (478%)

Pixel Rate

The Radeon R9 380 4G should be quite a bit (more or less 313%) better at FSAA than the Radeon R5 M255, and capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 380 4G		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 max amount of data (counted in MB per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the 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 the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.