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GeForce 8800 GTS (G80) 320MB vs GeForce GT 640 DDR3

Intro

The GeForce 8800 GTS (G80) 320MB makes use of a 90 nm design. nVidia has clocked the core frequency at 513 MHz. The GDDR3 memory works at a frequency of 792 MHz on this model. It features 96 SPUs along with 48 Texture Address Units and 20 Rasterization Operator Units.

Compare those specs to the GeForce GT 640 DDR3, which uses a 28 nm design. nVidia has clocked the core speed at 900 MHz. The DDR3 RAM runs at a frequency of 1782 MHz on this card. It features 384 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce 8800 GTS (G80) 320MB 143 Watts
Difference: 78 Watts (120%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 GTS (G80) 320MB is 11% quicker than the GeForce GT 640 DDR3 overall, due to its higher data rate. (explain)

GeForce 8800 GTS (G80) 320MB 63360 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 6336 (11%)

Texel Rate

The GeForce GT 640 DDR3 will be just a bit (more or less 17%) more effective at anisotropic filtering than the GeForce 8800 GTS (G80) 320MB. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce 8800 GTS (G80) 320MB 24624 Mtexels/sec
Difference: 4176 (17%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GT 640 DDR3 is the winner, and very much so. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce 8800 GTS (G80) 320MB 10260 Mpixels/sec
Difference: 4140 (40%)

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 8800 GTS (G80) 320MB

Amazon.com

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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 8800 GTS (G80) 320MB GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year Feb 2007 June 2012
Code Name G80 GK107
Memory 320 MB 2048 MB
Core Speed 513 MHz 900 MHz
Memory Speed 1584 MHz 3564 MHz
Power (Max TDP) 143 watts 65 watts
Bandwidth 63360 MB/sec 57024 MB/sec
Texel Rate 24624 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 10260 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 96 384
Texture Mapping Units 48 32
Render Output Units 20 16
Bus Type GDDR3 DDR3
Bus Width 320-bit 128-bit
Fab Process 90 nm 28 nm
Transistors 681 million 1300 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.0
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce 8800 GTS (G80) 320MB

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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