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GeForce 8500 GT vs GeForce 8600 GT 512MB DDR2

Intro

The GeForce 8500 GT features clock speeds of 450 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 memory. It features 16 SPUs as well as 8 Texture Address Units and 4 ROPs.

Compare that to the GeForce 8600 GT 512MB DDR2, which has clock speeds of 540 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 memory. It features 32 SPUs as well as 16 TAUs and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8500 GT 45 Watts
GeForce 8600 GT 512MB DDR2 47 Watts
Difference: 2 Watts (4%)

Memory Bandwidth

Both cards have exactly the same memory bandwidth, so theoretically they should perform the same. (explain)

Texel Rate

The GeForce 8600 GT 512MB DDR2 should be quite a bit (about 140%) better at texture filtering than the GeForce 8500 GT. (explain)

GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
GeForce 8500 GT 3600 Mtexels/sec
Difference: 5040 (140%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce 8600 GT 512MB DDR2 is superior to the GeForce 8500 GT, by a large margin. (explain)

GeForce 8600 GT 512MB DDR2 4320 Mpixels/sec
GeForce 8500 GT 1800 Mpixels/sec
Difference: 2520 (140%)

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 8500 GT

Amazon.com

Check prices at:

GeForce 8600 GT 512MB DDR2

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 8500 GT GeForce 8600 GT 512MB DDR2
Manufacturer nVidia nVidia
Year April 2007 April 2007
Code Name G86 G84
Memory 512 MB 512 MB
Core Speed 450 MHz 540 MHz
Memory Speed 800 MHz 800 MHz
Power (Max TDP) 45 watts 47 watts
Bandwidth 12800 MB/sec 12800 MB/sec
Texel Rate 3600 Mtexels/sec 8640 Mtexels/sec
Pixel Rate 1800 Mpixels/sec 4320 Mpixels/sec
Unified Shaders 16 32
Texture Mapping Units 8 16
Render Output Units 4 8
Bus Type DDR2 DDR2
Bus Width 128-bit 128-bit
Fab Process 80 nm 80 nm
Transistors 210 million 289 million
Bus PCIe x16, PCI, PCIe x16 2.0 PCIe x16
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be moved past 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 RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics 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 card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's 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 quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 8500 GT

Amazon.com

Check prices at:

GeForce 8600 GT 512MB DDR2

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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