GeForce GT 240 GDDR5 1GB vs Geforce GTX 680

Intro

Compare those specs to the Geforce GTX 680, which has a core clock frequency of 1006 MHz and a GDDR5 memory frequency of 1502 MHz. It also uses a 256-bit bus, and makes use of a 28 nm design. It features 1536 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

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

In theory, the Geforce GTX 680 is 253% quicker than the GeForce GT 240 GDDR5 1GB overall, due to its higher 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 is a lot (approximately 632%) faster with regards to anisotropic 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

The Geforce GTX 680 should be a lot (more or less 632%) more effective at full screen anti-aliasing than the GeForce GT 240 GDDR5 1GB, and will be capable of handling higher screen resolutions more effectively. (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: Memory bandwidth is the largest amount of data (measured in MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.