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GeForce 9500 GT DDR2 vs GeForce GT 640 DDR3

Intro

The GeForce 9500 GT DDR2 makes use of a 65 nm design. nVidia has clocked the core speed at 550 MHz. The DDR2 memory works at a frequency of 500 MHz on this particular card. It features 32 SPUs along with 16 Texture Address Units and 8 ROPs.

Compare that to the GeForce GT 640 DDR3, which features core clock speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs as well as 32 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9500 GT DDR2 50 Watts
GeForce GT 640 DDR3 65 Watts
Difference: 15 Watts (30%)

Memory Bandwidth

The GeForce GT 640 DDR3, in theory, should be a lot faster than the GeForce 9500 GT DDR2 in general. (explain)

GeForce GT 640 DDR3 57024 MB/sec
GeForce 9500 GT DDR2 16000 MB/sec
Difference: 41024 (256%)

Texel Rate

The GeForce GT 640 DDR3 should be quite a bit (about 227%) better at anisotropic filtering than the GeForce 9500 GT DDR2. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce 9500 GT DDR2 8800 Mtexels/sec
Difference: 20000 (227%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GT 640 DDR3 is a better choice, and very much so. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce 9500 GT DDR2 4400 Mpixels/sec
Difference: 10000 (227%)

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 9500 GT DDR2

Amazon.com

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GeForce GT 640 DDR3

Amazon.com

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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 9500 GT DDR2 GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year July 2008 June 2012
Code Name G96a GK107
Memory 256 MB 2048 MB
Core Speed 550 MHz 900 MHz
Memory Speed 1000 MHz 3564 MHz
Power (Max TDP) 50 watts 65 watts
Bandwidth 16000 MB/sec 57024 MB/sec
Texel Rate 8800 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 4400 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 32 384
Texture Mapping Units 16 32
Render Output Units 8 16
Bus Type DDR2 DDR3
Bus Width 128-bit 128-bit
Fab Process 65 nm 28 nm
Transistors 314 million 1300 million
Bus PCIe x16 2.0, PCI PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.0
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. 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 many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce 9500 GT DDR2

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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