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GeForce GTX 660 vs GeForce GTX 750 Ti

Intro

The GeForce GTX 660 makes use of a 28 nm design. nVidia has clocked the core speed at 980 MHz. The GDDR5 RAM runs at a speed of 1502 MHz on this model. It features 960 SPUs along with 80 Texture Address Units and 24 Rasterization Operator Units.

Compare those specifications to the GeForce GTX 750 Ti, which has core speeds of 1020 MHz on the GPU, and 1350 MHz on the 2048 MB of GDDR5 memory. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

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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 660		5063 points
GeForce GTX 750 Ti		4562 points
	Difference: 501 (11%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 750 Ti		60 Watts
GeForce GTX 660		140 Watts
	Difference: 80 Watts (133%)

Memory Bandwidth

Theoretically, the GeForce GTX 660 should be quite a bit faster than the GeForce GTX 750 Ti in general. (explain)

GeForce GTX 660		144192 MB/sec
GeForce GTX 750 Ti		86400 MB/sec
	Difference: 57792 (67%)

Texel Rate

The GeForce GTX 660 will be much (approximately 92%) better at texture filtering than the GeForce GTX 750 Ti. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GTX 750 Ti		40800 Mtexels/sec
	Difference: 37600 (92%)

Pixel Rate

The GeForce GTX 660 will be quite a bit (more or less 44%) more effective at FSAA than the GeForce GTX 750 Ti, and will be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GTX 750 Ti		16320 Mpixels/sec
	Difference: 7200 (44%)

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

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GeForce GTX 660

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GeForce GTX 750 Ti

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Specifications

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Model	GeForce GTX 660	GeForce GTX 750 Ti
Manufacturer	nVidia	nVidia
Year	September 2012	February 2014
Code Name	GK106	GM107
Memory	2048 MB	2048 MB
Core Speed	980 MHz	1020 MHz
Memory Speed	6008 MHz	5400 MHz
Power (Max TDP)	140 watts	60 watts
Bandwidth	144192 MB/sec	86400 MB/sec
Texel Rate	78400 Mtexels/sec	40800 Mtexels/sec
Pixel Rate	23520 Mpixels/sec	16320 Mpixels/sec
Unified Shaders	960	640
Texture Mapping Units	80	40
Render Output Units	24	16
Bus Type	GDDR5	GDDR5
Bus Width	192-bit	128-bit
Fab Process	28 nm	28 nm
Transistors	2540 million	1870 million
Bus	PCIe 3.0 x16	PCIe 3.0 x16
DirectX Version	DirectX 11.0	DirectX 11.0
OpenGL Version	OpenGL 4.3	OpenGL 4.4

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units of the card by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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