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GeForce GT 430 vs GeForce GT 640 DDR3


The GeForce GT 430 uses a 40 nm design. nVidia has clocked the core frequency at 700 MHz. The GDDR3 memory runs at a frequency of 900 MHz on this specific card. It features 96 SPUs as well as 16 TAUs and 4 Rasterization Operator Units.

Compare those specs to the GeForce GT 640 DDR3, which uses a 28 nm design. nVidia has set the core speed at 900 MHz. The DDR3 RAM works at a frequency of 1782 MHz on this specific model. It features 384 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 430 60 Watts
GeForce GT 640 DDR3 65 Watts
Difference: 5 Watts (8%)

Memory Bandwidth

Theoretically, the GeForce GT 640 DDR3 should perform much faster than the GeForce GT 430 overall. (explain)

GeForce GT 640 DDR3 57024 MB/sec
GeForce GT 430 28800 MB/sec
Difference: 28224 (98%)

Texel Rate

The GeForce GT 640 DDR3 is quite a bit (about 157%) more effective at anisotropic filtering than the GeForce GT 430. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce GT 430 11200 Mtexels/sec
Difference: 17600 (157%)

Pixel Rate

The GeForce GT 640 DDR3 is much (more or less 414%) better at AA than the GeForce GT 430, and should be able to handle higher screen resolutions better. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce GT 430 2800 Mpixels/sec
Difference: 11600 (414%)

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 430

GeForce GT 640 DDR3

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.


Display Specifications

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Model GeForce GT 430 GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year October 2010 June 2012
Code Name GF108 GK107
Memory 512 MB 2048 MB
Core Speed 700 MHz 900 MHz
Memory Speed 1800 MHz 3564 MHz
Power (Max TDP) 60 watts 65 watts
Bandwidth 28800 MB/sec 57024 MB/sec
Texel Rate 11200 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 96 384
Texture Mapping Units 16 32
Render Output Units 4 16
Bus Type GDDR3 DDR3
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 585 million 1300 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.0
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 are applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated 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 outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.


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