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GeForce GTX 650 Ti vs GeForce GTX 660 Ti

Intro

The GeForce GTX 650 Ti features a core clock frequency of 928 MHz and a GDDR5 memory frequency of 1350 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 768 SPUs, 64 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the GeForce GTX 660 Ti, which uses a 28 nm design. nVidia has set the core frequency at 915 MHz. The GDDR5 memory is set to run at a speed of 1500 MHz on this specific model. It features 1344 SPUs along with 112 TAUs and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti 110 Watts
GeForce GTX 660 Ti 150 Watts
Difference: 40 Watts (36%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 Ti should theoretically be much better than the GeForce GTX 650 Ti overall. (explain)

GeForce GTX 660 Ti 144000 MB/sec
GeForce GTX 650 Ti 86400 MB/sec
Difference: 57600 (67%)

Texel Rate

The GeForce GTX 660 Ti will be a lot (about 73%) more effective at AF than the GeForce GTX 650 Ti. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
GeForce GTX 650 Ti 59392 Mtexels/sec
Difference: 43088 (73%)

Pixel Rate

The GeForce GTX 660 Ti will be a lot (approximately 48%) more effective at AA than the GeForce GTX 650 Ti, and capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 660 Ti 21960 Mpixels/sec
GeForce GTX 650 Ti 14848 Mpixels/sec
Difference: 7112 (48%)

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 650 Ti

Amazon.com

GeForce GTX 660 Ti

Amazon.com

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 650 Ti GeForce GTX 660 Ti
Manufacturer nVidia nVidia
Year October 2012 August 2012
Code Name GK106 GK104
Memory 1024 MB 2048 MB
Core Speed 928 MHz 915 MHz
Memory Speed 5400 MHz 6000 MHz
Power (Max TDP) 110 watts 150 watts
Bandwidth 86400 MB/sec 144000 MB/sec
Texel Rate 59392 Mtexels/sec 102480 Mtexels/sec
Pixel Rate 14848 Mpixels/sec 21960 Mpixels/sec
Unified Shaders 768 1344
Texture Mapping Units 64 112
Render Output Units 16 24
Bus Type GDDR5 GDDR5
Bus Width 128-bit 192-bit
Fab Process 28 nm 28 nm
Transistors 2540 million 3540 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.0
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines 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 fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

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