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GeForce 8600 GTS vs GeForce GT 640 DDR3

Intro

The GeForce 8600 GTS comes with a core clock speed of 675 MHz and a GDDR3 memory speed of 1000 MHz. It also features a 128-bit bus, and makes use of a 80 nm design. It features 32 SPUs, 16 Texture Address Units, and 8 ROPs.

Compare all that to the GeForce GT 640 DDR3, which comes with core 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 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce 8600 GTS 75 Watts
Difference: 10 Watts (15%)

Memory Bandwidth

In theory, the GeForce GT 640 DDR3 is 78% quicker than the GeForce 8600 GTS in general, due to its higher bandwidth. (explain)

GeForce GT 640 DDR3 57024 MB/sec
GeForce 8600 GTS 32000 MB/sec
Difference: 25024 (78%)

Texel Rate

The GeForce GT 640 DDR3 is quite a bit (approximately 167%) better at texture filtering than the GeForce 8600 GTS. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce 8600 GTS 10800 Mtexels/sec
Difference: 18000 (167%)

Pixel Rate

The GeForce GT 640 DDR3 is a lot (approximately 167%) more effective at full screen anti-aliasing than the GeForce 8600 GTS, and capable of handling higher resolutions while still performing well. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce 8600 GTS 5400 Mpixels/sec
Difference: 9000 (167%)

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 8600 GTS

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 8600 GTS GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year April 2007 June 2012
Code Name G84 GK107
Memory 512 MB 2048 MB
Core Speed 675 MHz 900 MHz
Memory Speed 2000 MHz 3564 MHz
Power (Max TDP) 75 watts 65 watts
Bandwidth 32000 MB/sec 57024 MB/sec
Texel Rate 10800 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 5400 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 32 384
Texture Mapping Units 16 32
Render Output Units 8 16
Bus Type GDDR3 DDR3
Bus Width 128-bit 128-bit
Fab Process 80 nm 28 nm
Transistors 289 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 largest amount of information (measured in megabytes per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 amount of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write 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 the core speed of the card. ROPs (Raster Operations Pipelines - aka 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 of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 8600 GTS

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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