GeForce GTX 660 vs Geforce GTX 780

Intro

Compare that to the Geforce GTX 780, which uses a 28 nm design. nVidia has set the core speed at 863 MHz. The GDDR5 memory is set to run at a frequency of 1502 MHz on this particular model. It features 2304 SPUs as well as 192 TAUs 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		5063 points
	Difference: 5019 (99%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
Geforce GTX 780		250 Watts
	Difference: 110 Watts (79%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 780 will be 100% faster than the GeForce GTX 660 overall, due to its higher data rate. (explain)

Geforce GTX 780		288384 MB/sec
GeForce GTX 660		144192 MB/sec
	Difference: 144192 (100%)

Texel Rate

The Geforce GTX 780 will be a lot (more or less 111%) faster with regards to texture filtering than the GeForce GTX 660. (explain)

Geforce GTX 780		165696 Mtexels/sec
GeForce GTX 660		78400 Mtexels/sec
	Difference: 87296 (111%)

Pixel Rate

The Geforce GTX 780 will be quite a bit (approximately 76%) faster with regards to FSAA than the GeForce GTX 660, and able to handle higher screen resolutions better. (explain)

Geforce GTX 780		41424 Mpixels/sec
GeForce GTX 660		23520 Mpixels/sec
	Difference: 17904 (76%)

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 (counted in MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.