GeForce GT 320 vs GeForce GTX 660

Intro

Compare those specs 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 TAUs, and 24 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
GeForce GTX 660		140 Watts
	Difference: 97 Watts (226%)

Memory Bandwidth

In theory, the GeForce GTX 660 should be a lot faster than the GeForce GT 320 overall. (explain)

GeForce GTX 660		144192 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 118912 (470%)

Texel Rate

The GeForce GTX 660 is a lot (approximately 505%) better at texture filtering than the GeForce GT 320. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 65440 (505%)

Pixel Rate

The GeForce GTX 660 will be much (more or less 444%) better at anti-aliasing than the GeForce GT 320, and also capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 19200 (444%)

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 (in units of megabytes per second) that can be transported past 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, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 reach the maximum fill rate.