GeForce GTX 260 216SP 55 nm vs GeForce GTX 275

Intro

Compare those specifications to the GeForce GTX 275, which features a clock speed of 633 MHz and a GDDR3 memory frequency of 1134 MHz. It also makes use of a 448-bit memory bus, and makes use of a 55 nm design. It is comprised of 240 SPUs, 80 TAUs, and 28 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 260 216SP 55 nm		171 Watts
GeForce GTX 275		219 Watts
	Difference: 48 Watts (28%)

Memory Bandwidth

The GeForce GTX 275, in theory, should perform a little bit faster than the GeForce GTX 260 216SP 55 nm in general. (explain)

GeForce GTX 275		127008 MB/sec
GeForce GTX 260 216SP 55 nm		111888 MB/sec
	Difference: 15120 (14%)

Texel Rate

The GeForce GTX 275 is much (more or less 22%) more effective at texture filtering than the GeForce GTX 260 216SP 55 nm. (explain)

GeForce GTX 275		50640 Mtexels/sec
GeForce GTX 260 216SP 55 nm		41472 Mtexels/sec
	Difference: 9168 (22%)

Pixel Rate

The GeForce GTX 275 should be just a bit (about 10%) faster with regards to anti-aliasing than the GeForce GTX 260 216SP 55 nm, and also should be capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 275		17724 Mpixels/sec
GeForce GTX 260 216SP 55 nm		16128 Mpixels/sec
	Difference: 1596 (10%)

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 max amount of information (counted in MB per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.