GeForce GTX 580 3GB vs Radeon R9 380 2G

Intro

Compare all of that to the Radeon R9 380 2G, which comes with core clock speeds of 970 MHz on the GPU, and 1425 MHz on the 2048 MB of GDDR5 RAM. 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

Power Consumption (Max TDP)

Radeon R9 380 2G		190 Watts
GeForce GTX 580 3GB		244 Watts
	Difference: 54 Watts (28%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 580 3GB should be 5% quicker than the Radeon R9 380 2G overall, due to its higher bandwidth. (explain)

GeForce GTX 580 3GB		192384 MB/sec
Radeon R9 380 2G		182400 MB/sec
	Difference: 9984 (5%)

Texel Rate

The Radeon R9 380 2G is much (more or less 120%) better at texture filtering than the GeForce GTX 580 3GB. (explain)

Radeon R9 380 2G		108640 Mtexels/sec
GeForce GTX 580 3GB		49408 Mtexels/sec
	Difference: 59232 (120%)

Pixel Rate

The GeForce GTX 580 3GB should be a small bit (more or less 19%) faster with regards to anti-aliasing than the Radeon R9 380 2G, and also able to handle higher resolutions more effectively. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon R9 380 2G		31040 Mpixels/sec
	Difference: 6016 (19%)

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 data (in units of megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 can be processed per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's 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 rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.