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GeForce GTS 450 vs GeForce GTX 550 Ti

Intro

The GeForce GTS 450 comes with a GPU core clock speed of 783 MHz, and the 512 MB of GDDR5 RAM is set to run at 902 MHz through a 128-bit bus. It also is made up of 192 SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare that to the GeForce GTX 550 Ti, which has a core clock speed of 900 MHz and a GDDR5 memory speed of 1026 MHz. It also uses a 192-bit bus, and makes use of a 40 nm design. It is comprised of 192 SPUs, 32 Texture Address Units, and 24 Raster Operation Units.

Display Graphs

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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

Performance-wise, the GeForce GTX 550 Ti should theoretically be much superior to 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 is a small bit (about 15%) more effective at AF than the GeForce GTS 450. (explain)

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

Pixel Rate

The GeForce GTX 550 Ti should be a lot (about 72%) faster with regards to AA than the GeForce GTS 450, and also will be capable of handling higher resolutions more effectively. (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

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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

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Model GeForce GTS 450 GeForce GTX 550 Ti
Manufacturer nVidia nVidia
Year September 2010 March 2011
Code Name GF106 GF116
Memory 512 MB 1024 MB
Core Speed 783 MHz 900 MHz
Memory Speed 3608 MHz 4104 MHz
Power (Max TDP) 106 watts 116 watts
Bandwidth 57728 MB/sec 98496 MB/sec
Texel Rate 25056 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 21600 Mpixels/sec
Unified Shaders 192 192
Texture Mapping Units 32 32
Render Output Units 16 24
Bus Type GDDR5 GDDR5
Bus Width 128-bit 192-bit
Fab Process 40 nm 40 nm
Transistors 1170 million 1170 million
Bus PCIe x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the 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 number of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the video 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 amount of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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