GeForce GTX 580 vs Radeon R9 M380

Intro

Compare all that to the Radeon R9 M380, which features GPU core speed of 1000 MHz, and 4096 MB of GDDR5 RAM set to run at 1500 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTX 580, in theory, should be much faster than the Radeon R9 M380 overall. (explain)

GeForce GTX 580		192384 MB/sec
Radeon R9 M380		96000 MB/sec
	Difference: 96384 (100%)

Texel Rate

The GeForce GTX 580 will be much (approximately 24%) more effective at anisotropic filtering than the Radeon R9 M380. (explain)

GeForce GTX 580		49408 Mtexels/sec
Radeon R9 M380		40000 Mtexels/sec
	Difference: 9408 (24%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 580 is a better choice, and very much so. (explain)

GeForce GTX 580		37056 Mpixels/sec
Radeon R9 M380		16000 Mpixels/sec
	Difference: 21056 (132%)

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 information (in units of MB per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.