GeForce GTX 275 vs GeForce GTX 580

Intro

Compare all of that to the GeForce GTX 580, which features a core clock speed of 772 MHz and a GDDR5 memory speed of 1002 MHz. It also makes use of a 384-bit memory bus, and makes use of a 40 nm design. It is made up of 512 SPUs, 64 Texture Address Units, and 48 Raster Operation Units.

Display Graphs

Hide Graphs

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, in theory, should perform quite a bit 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 will be just a bit (approximately 2%) more effective at AF 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 will be a lot (approximately 109%) better at FSAA than the GeForce GTX 275, and able to handle higher resolutions while still performing well. (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 maximum amount of information (counted in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. 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 are applied in one second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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