GeForce GTX 580 3GB vs Radeon R9 M385X

Intro

Compare that to the Radeon R9 M385X, which has a GPU core clock speed of 1100 MHz, and 4096 MB of GDDR5 memory running at 1500 MHz through a 128-bit bus. It also is comprised of 896 SPUs, 56 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce GTX 580 3GB should be a lot faster than the Radeon R9 M385X overall. (explain)

GeForce GTX 580 3GB		192384 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 96384 (100%)

Texel Rate

The Radeon R9 M385X should be quite a bit (about 25%) faster with regards to anisotropic filtering than the GeForce GTX 580 3GB. (explain)

Radeon R9 M385X		61600 Mtexels/sec
GeForce GTX 580 3GB		49408 Mtexels/sec
	Difference: 12192 (25%)

Pixel Rate

The GeForce GTX 580 3GB is a lot (about 111%) better at full screen anti-aliasing than the Radeon R9 M385X, and also capable of handling higher resolutions better. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 19456 (111%)

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 information (measured in MB per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR 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 worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.