GeForce GTX 275 vs GeForce GTX 660

Intro

Compare those specs to the GeForce GTX 660, which comes with clock speeds of 980 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 memory. It features 960 SPUs as well as 80 Texture Address Units and 24 Rasterization Operator Units.

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

Theoretically, the GeForce GTX 660 should be just 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 will be much (about 55%) faster with regards to AF than the GeForce GTX 275. (explain)

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

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 660 is the winner, by a large margin. (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: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen 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 texture units of the card 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 in one second.

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