GeForce GTX 660 Ti vs Geforce GTX 680

Intro

Compare all of that to the Geforce GTX 680, which has a GPU core clock speed of 1006 MHz, and 2048 MB of GDDR5 memory running at 1502 MHz through a 256-bit bus. It also is made up of 1536 Stream Processors, 128 TAUs, and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Geforce GTX 680		7650 points
GeForce GTX 660 Ti		6013 points
	Difference: 1637 (27%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti		150 Watts
Geforce GTX 680		195 Watts
	Difference: 45 Watts (30%)

Memory Bandwidth

As far as performance goes, the Geforce GTX 680 should theoretically be a lot better than the GeForce GTX 660 Ti overall. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GTX 660 Ti		144000 MB/sec
	Difference: 48256 (34%)

Texel Rate

The Geforce GTX 680 will be a lot (about 26%) faster with regards to AF than the GeForce GTX 660 Ti. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GTX 660 Ti		102480 Mtexels/sec
	Difference: 26288 (26%)

Pixel Rate

The Geforce GTX 680 should be much (more or less 47%) better at anti-aliasing than the GeForce GTX 660 Ti, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GTX 660 Ti		21960 Mpixels/sec
	Difference: 10232 (47%)

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 max amount of data (in units of megabytes per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 amount of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. 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 lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.