GeForce GT 440 3GB vs GeForce GTX 660

Intro

Compare all that to the GeForce GTX 660, which features GPU clock speed of 980 MHz, and 2048 MB of GDDR5 memory running at 1502 MHz through a 192-bit bus. It also features 960 Stream Processors, 80 Texture Address Units, and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 440 3GB		56 Watts
GeForce GTX 660		140 Watts
	Difference: 84 Watts (150%)

Memory Bandwidth

In theory, the GeForce GTX 660 will be 234% faster than the GeForce GT 440 3GB overall, because of its higher bandwidth. (explain)

GeForce GTX 660		144192 MB/sec
GeForce GT 440 3GB		43200 MB/sec
	Difference: 100992 (234%)

Texel Rate

The GeForce GTX 660 will be much (approximately 450%) better at anisotropic filtering than the GeForce GT 440 3GB. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GT 440 3GB		14256 Mtexels/sec
	Difference: 64144 (450%)

Pixel Rate

The GeForce GTX 660 is much (more or less 65%) faster with regards to AA than the GeForce GT 440 3GB, and also should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GT 440 3GB		14256 Mpixels/sec
	Difference: 9264 (65%)

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 largest amount of data (counted in MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.