GeForce GTX 580 3GB vs GeForce GTX 650

Intro

Compare that to the GeForce GTX 650, which features GPU core speed of 1058 MHz, and 1024 MB of GDDR5 RAM running at 1250 MHz through a 128-bit bus. It also features 384 SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GTX 580 3GB		244 Watts
	Difference: 180 Watts (281%)

Memory Bandwidth

The GeForce GTX 580 3GB should theoretically perform a lot faster than the GeForce GTX 650 overall. (explain)

GeForce GTX 580 3GB		192384 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 112384 (140%)

Texel Rate

The GeForce GTX 580 3GB should be quite a bit (more or less 46%) faster with regards to anisotropic filtering than the GeForce GTX 650. (explain)

GeForce GTX 580 3GB		49408 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 15552 (46%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 580 3GB is the winner, by a large margin. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 20128 (119%)

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 (in units of megabytes per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.