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GeForce 8400 GS 512MB vs GeForce 8500 GT

Intro

The GeForce 8400 GS 512MB comes with a GPU core clock speed of 650 MHz, and the 512 MB of DDR2 RAM is set to run at 400 MHz through a 64-bit bus. It also is comprised of 16 SPUs, 8 Texture Address Units, and 4 ROPs.

Compare those specs to the GeForce 8500 GT, which features a core clock frequency of 450 MHz and a DDR2 memory speed of 400 MHz. It also makes use of a 128-bit memory bus, and makes use of a 80 nm design. It features 16 SPUs, 8 Texture Address Units, and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB 40 Watts
GeForce 8500 GT 45 Watts
Difference: 5 Watts (13%)

Memory Bandwidth

In theory, the GeForce 8500 GT should be much faster than the GeForce 8400 GS 512MB overall. (explain)

GeForce 8500 GT 12800 MB/sec
GeForce 8400 GS 512MB 6400 MB/sec
Difference: 6400 (100%)

Texel Rate

The GeForce 8400 GS 512MB will be quite a bit (about 44%) more effective at texture filtering than the GeForce 8500 GT. (explain)

GeForce 8400 GS 512MB 5200 Mtexels/sec
GeForce 8500 GT 3600 Mtexels/sec
Difference: 1600 (44%)

Pixel Rate

The GeForce 8400 GS 512MB should be much (approximately 44%) more effective at FSAA than the GeForce 8500 GT, and also will be able to handle higher screen resolutions while still performing well. (explain)

GeForce 8400 GS 512MB 2600 Mpixels/sec
GeForce 8500 GT 1800 Mpixels/sec
Difference: 800 (44%)

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 8500 GT

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 8500 GT
Manufacturer nVidia nVidia
Year June 2007 April 2007
Code Name G86 G86
Memory 512 MB 512 MB
Core Speed 650 MHz 450 MHz
Memory Speed 800 MHz 800 MHz
Power (Max TDP) 40 watts 45 watts
Bandwidth 6400 MB/sec 12800 MB/sec
Texel Rate 5200 Mtexels/sec 3600 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 1800 Mpixels/sec
Unified Shaders 16 16
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type DDR2 DDR2
Bus Width 64-bit 128-bit
Fab Process 80 nm 80 nm
Transistors 210 million 210 million
Bus PCIe x16, PCI 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 maximum amount of data (in units of megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce 8400 GS 512MB

Amazon.com

Check prices at:

GeForce 8500 GT

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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