GeForce GTX 580 3GB vs Radeon R9 380X

Intro

Compare those specifications to the Radeon R9 380X, which comes with a core clock frequency of 970 MHz and a GDDR5 memory speed of 1425 MHz. It also makes use of a 256-bit bus, and uses a 28 nm design. It features 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

In theory, the GeForce GTX 580 3GB is 5% quicker than the Radeon R9 380X in general, due to its greater data rate. (explain)

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

Texel Rate

The Radeon R9 380X will be a lot (about 151%) faster with regards to anisotropic filtering than the GeForce GTX 580 3GB. (explain)

Radeon R9 380X		124160 Mtexels/sec
GeForce GTX 580 3GB		49408 Mtexels/sec
	Difference: 74752 (151%)

Pixel Rate

The GeForce GTX 580 3GB is a little bit (more or less 19%) more effective at FSAA than the Radeon R9 380X, and also will be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon R9 380X		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 (counted in MB per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.