GeForce GT 240 GDDR5 vs GeForce GTX 660

Intro

Compare all that to the GeForce GTX 660, which has 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 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

Performance-wise, the GeForce GTX 660 should in theory be much better than 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 (more or less 345%) better 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

The GeForce GTX 660 should be a lot (approximately 435%) better at FSAA than the GeForce GT 240 GDDR5, and also should be able to handle higher resolutions more effectively. (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 largest amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.