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GeForce GT 430 vs GeForce GT 640 DDR3


Intro

The GeForce GT 430 has a GPU core clock speed of 700 MHz, and the 512 MB of GDDR3 RAM is set to run at 900 MHz through a 128-bit bus. It also features 96 Stream Processors, 16 TAUs, and 4 Raster Operation Units.

Compare all of that to the GeForce GT 640 DDR3, which makes use of a 28 nm design. nVidia has set the core speed at 900 MHz. The DDR3 memory is set to run at a frequency of 1782 MHz on this specific model. It features 384 SPUs as well as 32 TAUs and 16 ROPs.

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

In theory, the GeForce GT 640 DDR3 should be much faster than the GeForce GT 430 in general. (explain)

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

Texel Rate

The GeForce GT 640 DDR3 will be much (approximately 157%) faster with regards to texture 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 will be a lot (approximately 414%) more effective at anti-aliasing than the GeForce GT 430, and will be able to handle higher 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

GeForce GT 430

GeForce GT 640 DDR3

Specifications

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: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved past the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in a 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 - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

GeForce GT 430

GeForce GT 640 DDR3

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