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GeForce 8400 GS 512MB vs GeForce 9600 GT 1GB

Intro

The GeForce 8400 GS 512MB has core clock speeds of 650 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 RAM. It features 16 SPUs as well as 8 Texture Address Units and 4 Rasterization Operator Units.

Compare that to the GeForce 9600 GT 1GB, which has core speeds of 650 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR3 RAM. It features 64 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

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

Performance-wise, the GeForce 9600 GT 1GB should in theory be a lot superior to the GeForce 8400 GS 512MB overall. (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 will be quite a bit (about 300%) faster with regards to texture 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 screen resolution is important to you, then the GeForce 9600 GT 1GB is superior to the GeForce 8400 GS 512MB, and very much so. (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

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

Model GeForce 8400 GS 512MB GeForce 9600 GT 1GB
Manufacturer nVidia nVidia
Year June 2007 Feb 2008
Code Name G86 G94a/b
Fab Process 80 nm 65/55 nm
Bus PCIe x16, PCI PCIe x16 2.0
Memory 512 MB 1024 MB
Core Speed 650 MHz 650 MHz
Shader Speed 1100 MHz 1625 MHz
Memory Speed 400 MHz (800 MHz effective) 900 MHz (1800 MHz effective)
Unified Shaders 16 64
Texture Mapping Units 8 32
Render Output Units 4 16
Bus Type DDR2 GDDR3
Bus Width 64-bit 256-bit
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0
Power (Max TDP) 40 watts 95 watts
Shader Model 4.0 4.0
Bandwidth 6400 MB/sec 57600 MB/sec
Texel Rate 5200 Mtexels/sec 20800 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 10400 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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

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