GeForce GTX 660 Ti vs Geforce GTX 780

Intro

Compare those specs to the Geforce GTX 780, which has GPU clock speed of 863 MHz, and 3072 MB of GDDR5 RAM running at 1502 MHz through a 384-bit bus. It also is made up of 2304 Stream Processors, 192 Texture Address Units, and 48 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 780		10082 points
GeForce GTX 660 Ti		6013 points
	Difference: 4069 (68%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti		150 Watts
Geforce GTX 780		250 Watts
	Difference: 100 Watts (67%)

Memory Bandwidth

In theory, the Geforce GTX 780 should perform much faster than the GeForce GTX 660 Ti in general. (explain)

Geforce GTX 780		288384 MB/sec
GeForce GTX 660 Ti		144000 MB/sec
	Difference: 144384 (100%)

Texel Rate

The Geforce GTX 780 is much (about 62%) faster with regards to texture filtering than the GeForce GTX 660 Ti. (explain)

Geforce GTX 780		165696 Mtexels/sec
GeForce GTX 660 Ti		102480 Mtexels/sec
	Difference: 63216 (62%)

Pixel Rate

The Geforce GTX 780 will be quite a bit (about 89%) faster with regards to full screen anti-aliasing than the GeForce GTX 660 Ti, and able to handle higher screen resolutions without slowing down too much. (explain)

Geforce GTX 780		41424 Mpixels/sec
GeForce GTX 660 Ti		21960 Mpixels/sec
	Difference: 19464 (89%)

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 maximum amount of information (in units of megabytes per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one 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 colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.