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GeForce 8600 GT 512MB GDDR3 vs GeForce 8800 GTS (G80) 640MB

Intro

The GeForce 8600 GT 512MB GDDR3 comes with a clock frequency of 540 MHz and a GDDR3 memory frequency of 700 MHz. It also makes use of a 128-bit bus, and uses a 80 nm design. It features 32 SPUs, 16 TAUs, and 8 Raster Operation Units.

Compare all that to the GeForce 8800 GTS (G80) 640MB, which comes with a GPU core clock speed of 513 MHz, and 640 MB of GDDR3 memory set to run at 792 MHz through a 320-bit bus. It also features 96 Stream Processors, 48 Texture Address Units, and 20 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 512MB GDDR3 47 Watts
GeForce 8800 GTS (G80) 640MB 143 Watts
Difference: 96 Watts (204%)

Memory Bandwidth

As far as performance goes, the GeForce 8800 GTS (G80) 640MB should theoretically be quite a bit superior to the GeForce 8600 GT 512MB GDDR3 in general. (explain)

GeForce 8800 GTS (G80) 640MB 63360 MB/sec
GeForce 8600 GT 512MB GDDR3 22400 MB/sec
Difference: 40960 (183%)

Texel Rate

The GeForce 8800 GTS (G80) 640MB is quite a bit (approximately 185%) faster with regards to texture filtering than the GeForce 8600 GT 512MB GDDR3. (explain)

GeForce 8800 GTS (G80) 640MB 24624 Mtexels/sec
GeForce 8600 GT 512MB GDDR3 8640 Mtexels/sec
Difference: 15984 (185%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce 8800 GTS (G80) 640MB is a better choice, by far. (explain)

GeForce 8800 GTS (G80) 640MB 10260 Mpixels/sec
GeForce 8600 GT 512MB GDDR3 4320 Mpixels/sec
Difference: 5940 (138%)

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 GT 512MB GDDR3

Amazon.com

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GeForce 8800 GTS (G80) 640MB

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 GT 512MB GDDR3 GeForce 8800 GTS (G80) 640MB
Manufacturer nVidia nVidia
Year April 2007 Nov 2006 (640)
Code Name G84 G80
Memory 512 MB 640 MB
Core Speed 540 MHz 513 MHz
Memory Speed 1400 MHz 1584 MHz
Power (Max TDP) 47 watts 143 watts
Bandwidth 22400 MB/sec 63360 MB/sec
Texel Rate 8640 Mtexels/sec 24624 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 10260 Mpixels/sec
Unified Shaders 32 96
Texture Mapping Units 16 48
Render Output Units 8 20
Bus Type GDDR3 GDDR3
Bus Width 128-bit 320-bit
Fab Process 80 nm 90 nm
Transistors 289 million 681 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 can be applied per second. This is calculated by multiplying the total 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its 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 - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce 8600 GT 512MB GDDR3

Amazon.com

Check prices at:

GeForce 8800 GTS (G80) 640MB

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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