GeForce GTX 275 vs GeForce GTX 580

Intro

Compare those specs to the GeForce GTX 580, which comes with a clock speed of 772 MHz and a GDDR5 memory frequency of 1002 MHz. It also makes use of a 384-bit bus, and uses a 40 nm design. It features 512 SPUs, 64 TAUs, and 48 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 275		219 Watts
GeForce GTX 580		244 Watts
	Difference: 25 Watts (11%)

Memory Bandwidth

The GeForce GTX 580 should in theory perform a lot faster than the GeForce GTX 275 overall. (explain)

GeForce GTX 580		192384 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 65376 (51%)

Texel Rate

The GeForce GTX 275 should be a little bit (more or less 2%) faster with regards to anisotropic filtering than the GeForce GTX 580. (explain)

GeForce GTX 275		50640 Mtexels/sec
GeForce GTX 580		49408 Mtexels/sec
	Difference: 1232 (2%)

Pixel Rate

The GeForce GTX 580 should be much (about 109%) more effective at AA than the GeForce GTX 275, and will be capable of handling higher resolutions better. (explain)

GeForce GTX 580		37056 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 19332 (109%)

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: Bandwidth is the largest amount of data (counted in MB per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the card's bus 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 better the card's memory bandwidth, the faster 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 are applied in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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