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GeForce GTX 550 Ti vs GeForce GTX 660 Ti

Intro

The GeForce GTX 550 Ti comes with a clock speed of 900 MHz and a GDDR5 memory frequency of 1026 MHz. It also features a 192-bit bus, and uses a 40 nm design. It is comprised of 192 SPUs, 32 Texture Address Units, and 24 ROPs.

Compare all of that to the GeForce GTX 660 Ti, which makes use of a 28 nm design. nVidia has set the core frequency at 915 MHz. The GDDR5 RAM is set to run at a speed of 1500 MHz on this particular card. It features 1344 SPUs as well as 112 Texture Address Units and 24 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

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

As far as performance goes, the GeForce GTX 660 Ti should theoretically be a lot better 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 quite a bit (more or less 256%) more effective at AF 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

If running with a high resolution is important to you, then the GeForce GTX 660 Ti is a better choice, not by a very large margin though. (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

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

Model GeForce GTX 550 Ti GeForce GTX 660 Ti
Manufacturer nVidia nVidia
Year March 2011 August 2012
Code Name GF116 GK104
Fab Process 40 nm 28 nm
Bus PCIe 2.1 x16 PCIe 3.0 x16
Memory 1024 MB 2048 MB
Core Speed 900 MHz 915 MHz
Shader Speed 1800 MHz 915 MHz
Memory Speed 1026 MHz (4104 MHz effective) 1500 MHz (6000 MHz effective)
Unified Shaders 192 1344
Texture Mapping Units 32 112
Render Output Units 24 24
Bus Type GDDR5 GDDR5
Bus Width 192-bit 192-bit
DirectX Version DirectX 11 DirectX 11.0
OpenGL Version OpenGL 4.1 OpenGL 4.3
Power (Max TDP) 116 watts 150 watts
Shader Model 5.0 5.0
Bandwidth 98496 MB/sec 144000 MB/sec
Texel Rate 28800 Mtexels/sec 102480 Mtexels/sec
Pixel Rate 21600 Mpixels/sec 21960 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (measured in MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's 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 lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

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