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GeForce GTX 660 vs GeForce GTX 750 Ti

Intro

The GeForce GTX 660 uses a 28 nm design. nVidia has set the core frequency at 980 MHz. The GDDR5 memory works at a speed of 1502 MHz on this card. It features 960 SPUs as well as 80 Texture Address Units and 24 Rasterization Operator Units.

Compare those specifications to the GeForce GTX 750 Ti, which features a core clock frequency of 1020 MHz and a GDDR5 memory speed of 1350 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It is made up 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

As far as performance goes, the GeForce GTX 660 should theoretically be a lot better 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 is a lot (more or less 92%) faster with regards to 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 should be a lot (about 44%) faster with regards to anti-aliasing than the GeForce GTX 750 Ti, and also should be able to handle higher resolutions better. (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: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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