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GeForce 8400 GS 512MB vs GeForce 9500 GT DDR2

Intro

The GeForce 8400 GS 512MB features a GPU core clock speed of 650 MHz, and the 512 MB of DDR2 RAM runs at 400 MHz through a 64-bit bus. It also is made up of 16 SPUs, 8 TAUs, and 4 Raster Operation Units.

Compare those specs to the GeForce 9500 GT DDR2, which comes with core speeds of 550 MHz on the GPU, and 500 MHz on the 256 MB of DDR2 RAM. It features 32 SPUs along with 16 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB 40 Watts
GeForce 9500 GT DDR2 50 Watts
Difference: 10 Watts (25%)

Memory Bandwidth

Theoretically, the GeForce 9500 GT DDR2 should be a lot faster than the GeForce 8400 GS 512MB overall. (explain)

GeForce 9500 GT DDR2 16000 MB/sec
GeForce 8400 GS 512MB 6400 MB/sec
Difference: 9600 (150%)

Texel Rate

The GeForce 9500 GT DDR2 should be much (more or less 69%) faster with regards to anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

GeForce 9500 GT DDR2 8800 Mtexels/sec
GeForce 8400 GS 512MB 5200 Mtexels/sec
Difference: 3600 (69%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce 9500 GT DDR2 is superior to the GeForce 8400 GS 512MB, and very much so. (explain)

GeForce 9500 GT DDR2 4400 Mpixels/sec
GeForce 8400 GS 512MB 2600 Mpixels/sec
Difference: 1800 (69%)

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 9500 GT DDR2

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 9500 GT DDR2
Manufacturer nVidia nVidia
Year June 2007 July 2008
Code Name G86 G96a
Memory 512 MB 256 MB
Core Speed 650 MHz 550 MHz
Memory Speed 800 MHz 1000 MHz
Power (Max TDP) 40 watts 50 watts
Bandwidth 6400 MB/sec 16000 MB/sec
Texel Rate 5200 Mtexels/sec 8800 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 4400 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 65 nm
Transistors 210 million 314 million
Bus PCIe x16, PCI PCIe x16 2.0, PCI
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units 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 processed in one second.

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

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