GeForce GTX 275 vs GeForce GTX 660

Intro

Compare those specs to the GeForce GTX 660, which has a clock frequency of 980 MHz and a GDDR5 memory speed of 1502 MHz. It also makes use of a 192-bit bus, and makes use of a 28 nm design. It is made up of 960 SPUs, 80 Texture Address Units, and 24 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
GeForce GTX 275		219 Watts
	Difference: 79 Watts (56%)

Memory Bandwidth

The GeForce GTX 660, in theory, should perform a bit faster than the GeForce GTX 275 in general. (explain)

GeForce GTX 660		144192 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 17184 (14%)

Texel Rate

The GeForce GTX 660 should be much (approximately 55%) more effective at texture filtering than the GeForce GTX 275. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 27760 (55%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 660 is the winner, and very much so. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 5796 (33%)

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 data (counted in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the card's 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 lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.