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GeForce 8400 GS 512MB vs GeForce 8600 GS (OEM)

Intro

The GeForce 8400 GS 512MB has a clock frequency of 650 MHz and a DDR2 memory frequency of 400 MHz. It also uses a 64-bit memory bus, and makes use of a 80 nm design. It features 16 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Compare those specs to the GeForce 8600 GS (OEM), which has a clock frequency of 540 MHz and a DDR2 memory frequency of 400 MHz. It also uses a 128-bit memory bus, and uses a 80 nm design. It is comprised of 32 SPUs, 16 TAUs, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB 40 Watts
GeForce 8600 GS (OEM) 47 Watts
Difference: 7 Watts (18%)

Memory Bandwidth

Theoretically, the GeForce 8600 GS (OEM) should perform much faster than the GeForce 8400 GS 512MB overall. (explain)

GeForce 8600 GS (OEM) 12800 MB/sec
GeForce 8400 GS 512MB 6400 MB/sec
Difference: 6400 (100%)

Texel Rate

The GeForce 8600 GS (OEM) should be much (about 66%) more effective at AF than the GeForce 8400 GS 512MB. (explain)

GeForce 8600 GS (OEM) 8640 Mtexels/sec
GeForce 8400 GS 512MB 5200 Mtexels/sec
Difference: 3440 (66%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce 8600 GS (OEM) is superior to the GeForce 8400 GS 512MB, by a large margin. (explain)

GeForce 8600 GS (OEM) 4320 Mpixels/sec
GeForce 8400 GS 512MB 2600 Mpixels/sec
Difference: 1720 (66%)

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 8400 GS 512MB

Amazon.com

Check prices at:

GeForce 8600 GS (OEM)

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 8400 GS 512MB GeForce 8600 GS (OEM)
Manufacturer nVidia nVidia
Year June 2007 April 2007
Code Name G86 G84
Memory 512 MB 256 MB
Core Speed 650 MHz 540 MHz
Memory Speed 800 MHz 800 MHz
Power (Max TDP) 40 watts 47 watts
Bandwidth 6400 MB/sec 12800 MB/sec
Texel Rate 5200 Mtexels/sec 8640 Mtexels/sec
Pixel Rate 2600 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 64-bit 128-bit
Fab Process 80 nm 80 nm
Transistors 210 million 289 million
Bus PCIe x16, PCI PCIe x16
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, 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 texture units of the card 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 in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of 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

Hide Prices

GeForce 8400 GS 512MB

Amazon.com

Check prices at:

GeForce 8600 GS (OEM)

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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