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GeForce GTX 650 Ti vs GeForce GTX 660 Ti

Intro

The GeForce GTX 650 Ti makes use of a 28 nm design. nVidia has clocked the core speed at 928 MHz. The GDDR5 memory runs at a frequency of 1350 MHz on this particular model. It features 768 SPUs as well as 64 Texture Address Units and 16 ROPs.

Compare those specs to the GeForce GTX 660 Ti, which comes with a core clock frequency of 915 MHz and a GDDR5 memory frequency of 1500 MHz. It also features a 192-bit memory bus, and makes use of a 28 nm design. It is comprised of 1344 SPUs, 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

The GeForce GTX 660 Ti, in theory, should be quite a bit faster than the GeForce GTX 650 Ti in general. (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 should be a lot (more or less 73%) faster with regards to texture filtering 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

If using a high resolution is important to you, then the GeForce GTX 660 Ti is superior to the GeForce GTX 650 Ti, and very much so. (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: Bandwidth is the max amount of data (counted in megabytes per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high 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 amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends 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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