GeForce GTX 465 vs GeForce GTX 660

Intro

Compare those specs to the GeForce GTX 660, which has core clock speeds of 980 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 RAM. It features 960 SPUs as well as 80 Texture Address Units and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
GeForce GTX 465		200 Watts
	Difference: 60 Watts (43%)

Memory Bandwidth

The GeForce GTX 660 should in theory be a lot faster than the GeForce GTX 465 overall. (explain)

GeForce GTX 660		144192 MB/sec
GeForce GTX 465		102592 MB/sec
	Difference: 41600 (41%)

Texel Rate

The GeForce GTX 660 should be a lot (about 194%) more effective at anisotropic filtering than the GeForce GTX 465. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 51692 (194%)

Pixel Rate

The GeForce GTX 660 will be much (approximately 21%) faster with regards to full screen anti-aliasing than the GeForce GTX 465, and also should be able to handle higher resolutions better. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GTX 465		19424 Mpixels/sec
	Difference: 4096 (21%)

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 (counted in MB per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.