GeForce GTX 275 vs Geforce GTX 680

Intro

Compare that to the Geforce GTX 680, which makes use of a 28 nm design. nVidia has set the core speed at 1006 MHz. The GDDR5 RAM is set to run at a frequency of 1502 MHz on this model. It features 1536 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 680		195 Watts
GeForce GTX 275		219 Watts
	Difference: 24 Watts (12%)

Memory Bandwidth

In theory, the Geforce GTX 680 should be 51% quicker than the GeForce GTX 275 in general, because of its greater bandwidth. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 65248 (51%)

Texel Rate

The Geforce GTX 680 is a lot (more or less 154%) better at anisotropic filtering than the GeForce GTX 275. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 78128 (154%)

Pixel Rate

The Geforce GTX 680 is quite a bit (approximately 82%) more effective at anti-aliasing than the GeForce GTX 275, and should be able to handle higher resolutions while still performing well. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 14468 (82%)

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 information (in units of megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. 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 is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.