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GeForce 8400 GS 512MB vs GeForce 9600 GT 1GB

Intro

The GeForce 8400 GS 512MB makes use of a 80 nm design. nVidia has set the core frequency at 650 MHz. The DDR2 memory runs at a frequency of 400 MHz on this particular model. It features 16 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Compare all of that to the GeForce 9600 GT 1GB, which comes with a core clock frequency of 650 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 256-bit memory bus, and uses a 65/55 nm design. It features 64 SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB 40 Watts
GeForce 9600 GT 1GB 95 Watts
Difference: 55 Watts (138%)

Memory Bandwidth

The GeForce 9600 GT 1GB, in theory, should perform quite a bit faster than the GeForce 8400 GS 512MB in general. (explain)

GeForce 9600 GT 1GB 57600 MB/sec
GeForce 8400 GS 512MB 6400 MB/sec
Difference: 51200 (800%)

Texel Rate

The GeForce 9600 GT 1GB is much (about 300%) better at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

GeForce 9600 GT 1GB 20800 Mtexels/sec
GeForce 8400 GS 512MB 5200 Mtexels/sec
Difference: 15600 (300%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce 9600 GT 1GB is the winner, by far. (explain)

GeForce 9600 GT 1GB 10400 Mpixels/sec
GeForce 8400 GS 512MB 2600 Mpixels/sec
Difference: 7800 (300%)

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

GeForce 9600 GT 1GB

Amazon.com

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 9600 GT 1GB
Manufacturer nVidia nVidia
Year June 2007 Feb 2008
Code Name G86 G94a/b
Memory 512 MB 1024 MB
Core Speed 650 MHz 650 MHz
Memory Speed 800 MHz 1800 MHz
Power (Max TDP) 40 watts 95 watts
Bandwidth 6400 MB/sec 57600 MB/sec
Texel Rate 5200 Mtexels/sec 20800 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 10400 Mpixels/sec
Unified Shaders 16 64
Texture Mapping Units 8 32
Render Output Units 4 16
Bus Type DDR2 GDDR3
Bus Width 64-bit 256-bit
Fab Process 80 nm 65/55 nm
Transistors 210 million 505 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: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 processed per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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