GeForce GTX 580 3GB vs Radeon R9 380 2G

Intro

Compare that to the Radeon R9 380 2G, which has clock speeds of 970 MHz on the GPU, and 1425 MHz on the 2048 MB of GDDR5 memory. It features 1792 SPUs as well as 112 Texture Address Units and 32 ROPs.

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

In theory, the GeForce GTX 580 3GB should perform a little bit faster than the Radeon R9 380 2G in general. (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 should be quite a bit (approximately 120%) more effective at anisotropic 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 is a small bit (more or less 19%) more effective at AA than the Radeon R9 380 2G, and should be capable of handling higher screen resolutions while still performing well. (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 maximum amount of data (in units of MB per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total number of 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 that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.