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GeForce 9600 GT 512MB vs GeForce GT 640 DDR3

Intro

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

Compare all that to the GeForce GT 640 DDR3, which comes with GPU core speed of 900 MHz, and 2048 MB of DDR3 RAM set to run at 1782 MHz through a 128-bit bus. It also is comprised of 384 Stream Processors, 32 Texture Address Units, 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

As far as performance goes, the GeForce 9600 GT 512MB should in theory be a small bit better than the GeForce GT 640 DDR3 in general. (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 is much (about 38%) better at texture 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 will be quite a bit (approximately 38%) better at full screen anti-aliasing than the GeForce 9600 GT 512MB, and should be capable of handling higher resolutions better. (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 max amount of information (measured in MB per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number 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 is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

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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