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GeForce 9600 GT 512MB vs GeForce GT 640 DDR3

Intro

The GeForce 9600 GT 512MB comes with a core clock speed of 650 MHz and a GDDR3 memory frequency of 900 MHz. It also uses a 256-bit bus, and makes use of a 65/55 nm design. It is made up of 64 SPUs, 32 TAUs, and 16 Raster Operation Units.

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

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce 9600 GT 512MB 95 Watts
Difference: 30 Watts (46%)

Memory Bandwidth

In theory, the GeForce 9600 GT 512MB should perform a little bit faster than the GeForce GT 640 DDR3 overall. (explain)

GeForce 9600 GT 512MB 57600 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 576 (1%)

Texel Rate

The GeForce GT 640 DDR3 will be much (more or less 38%) faster with regards to anisotropic filtering than the GeForce 9600 GT 512MB. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce 9600 GT 512MB 20800 Mtexels/sec
Difference: 8000 (38%)

Pixel Rate

The GeForce GT 640 DDR3 is a lot (approximately 38%) more effective at AA than the GeForce 9600 GT 512MB, and will be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce 9600 GT 512MB 10400 Mpixels/sec
Difference: 4000 (38%)

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 9600 GT 512MB

Amazon.com

Check prices at:

GeForce GT 640 DDR3

Amazon.com

Check prices at:

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 9600 GT 512MB GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year Feb 2008 June 2012
Code Name G94a/b GK107
Memory 512 MB 2048 MB
Core Speed 650 MHz 900 MHz
Memory Speed 1800 MHz 3564 MHz
Power (Max TDP) 95 watts 65 watts
Bandwidth 57600 MB/sec 57024 MB/sec
Texel Rate 20800 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 10400 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 64 384
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type GDDR3 DDR3
Bus Width 256-bit 128-bit
Fab Process 65/55 nm 28 nm
Transistors 505 million 1300 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.0
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the 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 amount of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can 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 Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). 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.

Display Prices

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GeForce 9600 GT 512MB

Amazon.com

Check prices at:

GeForce GT 640 DDR3

Amazon.com

Check prices at:

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.

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