GeForce GT 320 vs GeForce GTX 660

Intro

Compare all that to the GeForce GTX 660, which features core clock speeds of 980 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 RAM. It features 960 SPUs along with 80 Texture Address Units and 24 Rasterization Operator 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

Performance-wise, the GeForce GTX 660 should in theory be quite a bit better 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 will be much (about 505%) better at AF 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 is much (about 444%) better at AA than the GeForce GT 320, and also will be capable of handling higher resolutions without slowing down too much. (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 data (counted in megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the video 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 most pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.