GeForce GT 240 GDDR5 vs GeForce GTX 660

Intro

Compare all of that 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 GT 240 GDDR5		70 Watts
GeForce GTX 660		140 Watts
	Difference: 70 Watts (100%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 should in theory be much superior to the GeForce GT 240 GDDR5 in general. (explain)

GeForce GTX 660		144192 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 89792 (165%)

Texel Rate

The GeForce GTX 660 is a lot (about 345%) more effective at anisotropic filtering than the GeForce GT 240 GDDR5. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 60800 (345%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 660 is superior to the GeForce GT 240 GDDR5, by a large margin. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 19120 (435%)

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 (measured in MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics 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 video card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units 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 also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.