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GeForce GT 430 vs GeForce GT 640 DDR3

Intro

The GeForce GT 430 comes with a core clock frequency of 700 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It features 96 SPUs, 16 TAUs, and 4 ROPs.

Compare all of that to the GeForce GT 640 DDR3, which uses a 28 nm design. nVidia has set the core speed at 900 MHz. The DDR3 memory works at a frequency of 1782 MHz on this particular model. It features 384 SPUs along with 32 Texture Address Units and 16 ROPs.

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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

The GeForce GT 640 DDR3 should theoretically 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 is much (about 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 quite a bit (approximately 414%) more effective at FSAA than the GeForce GT 430, and should be capable of handling higher resolutions while still performing well. (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

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

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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 (measured in MB per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it 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 AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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