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

Intro

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

Compare that to the GeForce 8600 GS (OEM), which features GPU core speed of 540 MHz, and 256 MB of DDR2 RAM running at 400 MHz through a 128-bit bus. It also 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

In theory, the GeForce 8600 GS (OEM) will be 100% quicker than the GeForce 8400 GS 512MB overall, because of its greater data rate. (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) will be much (more or less 66%) better 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

The GeForce 8600 GS (OEM) will be a lot (approximately 66%) better at FSAA than the GeForce 8400 GS 512MB, and able to handle higher resolutions without losing too much performance. (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: 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. The number is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher 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 can be applied in one second. This is worked out by multiplying the total number of texture units of the card 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum 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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