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GeForce GTX 650 Ti vs GeForce GTX 660 Ti

Intro

The GeForce GTX 650 Ti comes with clock speeds of 928 MHz on the GPU, and 1350 MHz on the 1024 MB of GDDR5 memory. It features 768 SPUs as well as 64 TAUs and 16 Rasterization Operator Units.

Compare all of that to the GeForce GTX 660 Ti, which comes with clock speeds of 915 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 memory. It features 1344 SPUs as well as 112 TAUs and 24 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

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 in theory be quite a bit 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 much (about 73%) more effective at 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

The GeForce GTX 660 Ti should be a lot (about 48%) more effective at full screen anti-aliasing than the GeForce GTX 650 Ti, and also should be able to handle higher screen resolutions without losing too much performance. (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

Display Prices

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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

Display 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
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 1024 MB 2048 MB
Core Speed 928 MHz 915 MHz
Shader Speed 928 MHz 915 MHz
Memory Speed 1350 MHz (5400 MHz effective) 1500 MHz (6000 MHz effective)
Unified Shaders 768 1344
Texture Mapping Units 64 112
Render Output Units 16 24
Bus Type GDDR5 GDDR5
Bus Width 128-bit 192-bit
DirectX Version DirectX 11.0 DirectX 11.0
OpenGL Version OpenGL 4.3 OpenGL 4.3
Power (Max TDP) 110 watts 150 watts
Shader Model 5.0 5.0
Bandwidth 86400 MB/sec 144000 MB/sec
Texel Rate 59392 Mtexels/sec 102480 Mtexels/sec
Pixel Rate 14848 Mpixels/sec 21960 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

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