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GeForce GTS 450 vs GeForce GTX 550 Ti

Intro

The GeForce GTS 450 makes use of a 40 nm design. nVidia has set the core speed at 783 MHz. The GDDR5 RAM works at a speed of 902 MHz on this specific card. It features 192 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare all that to the GeForce GTX 550 Ti, which makes use of a 40 nm design. nVidia has clocked the core frequency at 900 MHz. The GDDR5 RAM is set to run at a frequency of 1026 MHz on this particular card. It features 192 SPUs along with 32 TAUs and 24 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450 106 Watts
GeForce GTX 550 Ti 116 Watts
Difference: 10 Watts (9%)

Memory Bandwidth

The GeForce GTX 550 Ti should in theory be much faster than the GeForce GTS 450 in general. (explain)

GeForce GTX 550 Ti 98496 MB/sec
GeForce GTS 450 57728 MB/sec
Difference: 40768 (71%)

Texel Rate

The GeForce GTX 550 Ti should be a little bit (more or less 15%) better at texture filtering than the GeForce GTS 450. (explain)

GeForce GTX 550 Ti 28800 Mtexels/sec
GeForce GTS 450 25056 Mtexels/sec
Difference: 3744 (15%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 550 Ti is a better choice, and very much so. (explain)

GeForce GTX 550 Ti 21600 Mpixels/sec
GeForce GTS 450 12528 Mpixels/sec
Difference: 9072 (72%)

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 GTS 450

Amazon.com

GeForce GTX 550 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 GTS 450 GeForce GTX 550 Ti
Manufacturer nVidia nVidia
Year September 2010 March 2011
Code Name GF106 GF116
Fab Process 40 nm 40 nm
Bus PCIe x16 PCIe 2.1 x16
Memory 512 MB 1024 MB
Core Speed 783 MHz 900 MHz
Shader Speed 1566 MHz 1800 MHz
Memory Speed 902 MHz (3608 MHz effective) 1026 MHz (4104 MHz effective)
Unified Shaders 192 192
Texture Mapping Units 32 32
Render Output Units 16 24
Bus Type GDDR5 GDDR5
Bus Width 128-bit 192-bit
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1
Power (Max TDP) 106 watts 116 watts
Shader Model 5.0 5.0
Bandwidth 57728 MB/sec 98496 MB/sec
Texel Rate 25056 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 21600 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 can be applied in one second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the graphics 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 most pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant 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 max fill rate.

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