GeForce GTX 275 vs GeForce GTX 470

Intro

Compare those specs to the GeForce GTX 470, which has a clock frequency of 607 MHz and a GDDR5 memory speed of 837 MHz. It also features a 320-bit bus, and makes use of a 40 nm design. It is made up of 448 SPUs, 56 Texture Address Units, and 40 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 470		215 Watts
GeForce GTX 275		219 Watts
	Difference: 4 Watts (2%)

Memory Bandwidth

The GeForce GTX 470, in theory, should perform a little bit faster than the GeForce GTX 275 in general. (explain)

GeForce GTX 470		133920 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 6912 (5%)

Texel Rate

The GeForce GTX 275 will be a lot (about 49%) more effective at AF than the GeForce GTX 470. (explain)

GeForce GTX 275		50640 Mtexels/sec
GeForce GTX 470		33992 Mtexels/sec
	Difference: 16648 (49%)

Pixel Rate

The GeForce GTX 470 is much (about 37%) better at AA than the GeForce GTX 275, and also able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 470		24280 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 6556 (37%)

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 maximum amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs 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 rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.