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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 memory runs at 900 MHz through a 128-bit bus. It also is made up of 96 SPUs, 16 TAUs, and 4 ROPs.

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

(No game benchmarks for this combination yet.)

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

The GeForce GT 640 DDR3 should in theory be 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 should be quite a bit (more or less 157%) faster with regards to 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 should be much (approximately 414%) better at anti-aliasing than the GeForce GT 430, and also capable of handling higher screen resolutions more effectively. (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

Amazon.com

GeForce GT 640 DDR3

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 GT 430 GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year October 2010 June 2012
Code Name GF108 GK107
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 512 MB 2048 MB
Core Speed 700 MHz 900 MHz
Shader Speed 1400 MHz 900 MHz
Memory Speed 900 MHz (1800 MHz effective) 1782 MHz (3564 MHz effective)
Unified Shaders 96 384
Texture Mapping Units 16 32
Render Output Units 4 16
Bus Type GDDR3 DDR3
Bus Width 128-bit 128-bit
DirectX Version DirectX 11 DirectX 11.0
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 60 watts 65 watts
Shader Model 5.0 5.0
Bandwidth 28800 MB/sec 57024 MB/sec
Texel Rate 11200 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 14400 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

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