GeForce GT 240 GDDR5 1GB vs Geforce GTX 680

Intro

Compare all of that to the Geforce GTX 680, which comes with GPU clock speed of 1006 MHz, and 2048 MB of GDDR5 RAM running at 1502 MHz through a 256-bit bus. It also is comprised of 1536 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5 1GB		70 Watts
Geforce GTX 680		195 Watts
	Difference: 125 Watts (179%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 680 should be 253% quicker than the GeForce GT 240 GDDR5 1GB in general, due to its greater bandwidth. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 137856 (253%)

Texel Rate

The Geforce GTX 680 should be quite a bit (more or less 632%) more effective at texture filtering than the GeForce GT 240 GDDR5 1GB. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 111168 (632%)

Pixel Rate

If running with high levels of AA is important to you, then the Geforce GTX 680 is superior to the GeForce GT 240 GDDR5 1GB, by far. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 27792 (632%)

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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video 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 that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.