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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 particular card. It features 960 SPUs as well as 80 Texture Address Units and 24 ROPs.

Compare all of that to the GeForce GTX 750 Ti, which has a core clock speed of 1020 MHz and a GDDR5 memory frequency of 1350 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is comprised of 640 SPUs, 40 TAUs, 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

The GeForce GTX 660 should theoretically be much faster than the GeForce GTX 750 Ti overall. (explain)

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

Texel Rate

The GeForce GTX 660 should be much (more or less 92%) more effective at AF 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

If using a high screen resolution is important to you, then the GeForce GTX 660 is the winner, by a large margin. (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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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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 maximum amount of information (in units of MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 applied in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. 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 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 maximum fill rate.

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