GeForce GTX 580 3GB vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which features core speeds of 750 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
GeForce GTX 580 3GB		244 Watts
	Difference: 119 Watts (95%)

Memory Bandwidth

The GeForce GTX 580 3GB, in theory, should perform a bit faster than the Radeon R9 M295X overall. (explain)

GeForce GTX 580 3GB		192384 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 16384 (9%)

Texel Rate

The Radeon R9 M295X is a lot (more or less 94%) more effective at texture filtering than the GeForce GTX 580 3GB. (explain)

Radeon R9 M295X		96000 Mtexels/sec
GeForce GTX 580 3GB		49408 Mtexels/sec
	Difference: 46592 (94%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 580 3GB is the winner, by far. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 13056 (54%)

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 (counted in MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.