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GeForce GTS 450 vs GeForce GTX 550 Ti

Intro

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

Compare all of that to the GeForce GTX 550 Ti, which features core clock speeds of 900 MHz on the GPU, and 1026 MHz on the 1024 MB of GDDR5 RAM. It features 192 SPUs along with 32 TAUs and 24 Rasterization Operator Units.

(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

In theory, the GeForce GTX 550 Ti should perform a lot faster than the GeForce GTS 450 overall. (explain)

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

Texel Rate

The GeForce GTX 550 Ti will be a small bit (about 15%) better at anisotropic 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

The GeForce GTX 550 Ti should be quite a bit (about 72%) faster with regards to full screen anti-aliasing than the GeForce GTS 450, and also capable of handling higher screen resolutions while still performing well. (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: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also 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 - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

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