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GeForce GT 640 DDR3 vs GeForce GTX 550 Ti

Intro

The GeForce GT 640 DDR3 features clock speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs along with 32 Texture Address Units and 16 ROPs.

Compare that to the GeForce GTX 550 Ti, which features GPU core speed of 900 MHz, and 1024 MB of GDDR5 RAM running at 1026 MHz through a 192-bit bus. It also is made up of 192 Stream Processors, 32 Texture Address Units, and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce GTX 550 Ti 116 Watts
Difference: 51 Watts (78%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 550 Ti should theoretically be much superior to the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 550 Ti 98496 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 41472 (73%)

Texel Rate

Both cards have exactly the same texel fill rate, so theoretically they should be equally good at at anisotropic filtering. (explain)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 550 Ti is superior to the GeForce GT 640 DDR3, by a large margin. (explain)

GeForce GTX 550 Ti 21600 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 7200 (50%)

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 GT 640 DDR3

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 GT 640 DDR3 GeForce GTX 550 Ti
Manufacturer nVidia nVidia
Year June 2012 March 2011
Code Name GK107 GF116
Memory 2048 MB 1024 MB
Core Speed 900 MHz 900 MHz
Memory Speed 3564 MHz 4104 MHz
Power (Max TDP) 65 watts 116 watts
Bandwidth 57024 MB/sec 98496 MB/sec
Texel Rate 28800 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 21600 Mpixels/sec
Unified Shaders 384 192
Texture Mapping Units 32 32
Render Output Units 16 24
Bus Type DDR3 GDDR5
Bus Width 128-bit 192-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 1170 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed 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 the texel rate, 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 maximum number of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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