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GeForce 8400 GS 512MB vs GeForce 8800 GT 512MB

Intro

The GeForce 8400 GS 512MB makes use of a 80 nm design. nVidia has clocked the core frequency at 650 MHz. The DDR2 memory runs at a speed of 400 MHz on this specific card. It features 16 SPUs as well as 8 Texture Address Units and 4 ROPs.

Compare all that to the GeForce 8800 GT 512MB, which has a clock frequency of 600 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 256-bit memory bus, and makes use of a 65 nm design. It features 112 SPUs, 56 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB 40 Watts
GeForce 8800 GT 512MB 105 Watts
Difference: 65 Watts (163%)

Memory Bandwidth

The GeForce 8800 GT 512MB should theoretically be much faster than the GeForce 8400 GS 512MB in general. (explain)

GeForce 8800 GT 512MB 57600 MB/sec
GeForce 8400 GS 512MB 6400 MB/sec
Difference: 51200 (800%)

Texel Rate

The GeForce 8800 GT 512MB will be much (about 546%) faster with regards to anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

GeForce 8800 GT 512MB 33600 Mtexels/sec
GeForce 8400 GS 512MB 5200 Mtexels/sec
Difference: 28400 (546%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce 8800 GT 512MB is superior to the GeForce 8400 GS 512MB, by far. (explain)

GeForce 8800 GT 512MB 9600 Mpixels/sec
GeForce 8400 GS 512MB 2600 Mpixels/sec
Difference: 7000 (269%)

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

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GeForce 8800 GT 512MB

Amazon.com

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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 8800 GT 512MB
Manufacturer nVidia nVidia
Year June 2007 Oct 2007
Code Name G86 G92
Memory 512 MB 512 MB
Core Speed 650 MHz 600 MHz
Memory Speed 800 MHz 1800 MHz
Power (Max TDP) 40 watts 105 watts
Bandwidth 6400 MB/sec 57600 MB/sec
Texel Rate 5200 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 9600 Mpixels/sec
Unified Shaders 16 112
Texture Mapping Units 8 56
Render Output Units 4 16
Bus Type DDR2 GDDR3
Bus Width 64-bit 256-bit
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 information (in units of MB per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR 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 figure is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 8400 GS 512MB

Amazon.com

Check prices at:

GeForce 8800 GT 512MB

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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