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GeForce 8400 GS 512MB vs GeForce 9800 GX2

Intro

The GeForce 8400 GS 512MB uses a 80 nm design. nVidia has clocked the core speed at 650 MHz. The DDR2 RAM is set to run at a speed of 400 MHz on this particular model. It features 16 SPUs along with 8 TAUs and 4 ROPs.

Compare those specifications to the GeForce 9800 GX2, which features clock speeds of 600 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR3 memory. It features 128 SPUs as well as 64 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB 40 Watts
GeForce 9800 GX2 197 Watts
Difference: 157 Watts (393%)

Memory Bandwidth

As far as performance goes, the GeForce 9800 GX2 should theoretically be quite a bit better than the GeForce 8400 GS 512MB in general. (explain)

GeForce 9800 GX2 128000 MB/sec
GeForce 8400 GS 512MB 6400 MB/sec
Difference: 121600 (1900%)

Texel Rate

The GeForce 9800 GX2 will be much (about 1377%) more effective at AF than the GeForce 8400 GS 512MB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
GeForce 8400 GS 512MB 5200 Mtexels/sec
Difference: 71600 (1377%)

Pixel Rate

The GeForce 9800 GX2 is a lot (about 638%) more effective at anti-aliasing than the GeForce 8400 GS 512MB, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
GeForce 8400 GS 512MB 2600 Mpixels/sec
Difference: 16600 (638%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce 8400 GS 512MB

Amazon.com

Check prices at:

GeForce 9800 GX2

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 9800 GX2
Manufacturer nVidia nVidia
Year June 2007 Mar 2008
Code Name G86 G92
Memory 512 MB 512 MB (x2)
Core Speed 650 MHz 600 MHz (x2)
Memory Speed 800 MHz 2000 MHz (x2)
Power (Max TDP) 40 watts 197 watts
Bandwidth 6400 MB/sec 128000 MB/sec
Texel Rate 5200 Mtexels/sec 76800 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 19200 Mpixels/sec
Unified Shaders 16 128 (x2)
Texture Mapping Units 8 64 (x2)
Render Output Units 4 16 (x2)
Bus Type DDR2 GDDR3
Bus Width 64-bit 256-bit (x2)
Fab Process 80 nm 65 nm
Transistors 210 million 754 million
Bus PCIe x16, PCI PCIe x16 2.0
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. 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 lots of 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 8400 GS 512MB

Amazon.com

Check prices at:

GeForce 9800 GX2

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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