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GeForce GTX 550 Ti vs GeForce GTX 660 Ti

Intro

The GeForce GTX 550 Ti makes use of a 40 nm design. nVidia has set the core frequency at 900 MHz. The GDDR5 memory is set to run at a speed of 1026 MHz on this particular model. It features 192 SPUs along with 32 Texture Address Units and 24 ROPs.

Compare those specs to the GeForce GTX 660 Ti, which features clock speeds of 915 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 RAM. It features 1344 SPUs along with 112 Texture Address Units and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 550 Ti 116 Watts
GeForce GTX 660 Ti 150 Watts
Difference: 34 Watts (29%)

Memory Bandwidth

The GeForce GTX 660 Ti should theoretically perform a lot faster than the GeForce GTX 550 Ti overall. (explain)

GeForce GTX 660 Ti 144000 MB/sec
GeForce GTX 550 Ti 98496 MB/sec
Difference: 45504 (46%)

Texel Rate

The GeForce GTX 660 Ti will be a lot (more or less 256%) better at texture filtering than the GeForce GTX 550 Ti. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
GeForce GTX 550 Ti 28800 Mtexels/sec
Difference: 73680 (256%)

Pixel Rate

The GeForce GTX 660 Ti is a little bit (about 2%) faster with regards to FSAA than the GeForce GTX 550 Ti, and capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 660 Ti 21960 Mpixels/sec
GeForce GTX 550 Ti 21600 Mpixels/sec
Difference: 360 (2%)

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

GeForce GTX 550 Ti

GeForce GTX 660 Ti

Specifications

Display Specifications

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Model GeForce GTX 550 Ti GeForce GTX 660 Ti
Manufacturer nVidia nVidia
Year March 2011 August 2012
Code Name GF116 GK104
Memory 1024 MB 2048 MB
Core Speed 900 MHz 915 MHz
Memory Speed 4104 MHz 6000 MHz
Power (Max TDP) 116 watts 150 watts
Bandwidth 98496 MB/sec 144000 MB/sec
Texel Rate 28800 Mtexels/sec 102480 Mtexels/sec
Pixel Rate 21600 Mpixels/sec 21960 Mpixels/sec
Unified Shaders 192 1344
Texture Mapping Units 32 112
Render Output Units 24 24
Bus Type GDDR5 GDDR5
Bus Width 192-bit 192-bit
Fab Process 40 nm 28 nm
Transistors 1170 million 3540 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.0
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in MB per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out 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 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 the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

GeForce GTX 550 Ti

GeForce GTX 660 Ti

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