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GeForce 8400 GS 512MB vs GeForce 9600 GT 1GB

Intro

The GeForce 8400 GS 512MB has a GPU clock speed of 650 MHz, and the 512 MB of DDR2 RAM runs at 400 MHz through a 64-bit bus. It also is comprised of 16 Stream Processors, 8 TAUs, and 4 ROPs.

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

(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

In theory, the GeForce 9600 GT 1GB will be 800% faster than the GeForce 8400 GS 512MB overall, because of its higher bandwidth. (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 should be a lot (about 300%) more effective at AF 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

The GeForce 9600 GT 1GB is quite a bit (approximately 300%) better at anti-aliasing than the GeForce 8400 GS 512MB, and also should be capable of handling higher screen resolutions without losing too much performance. (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 data (counted in MB per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the 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 are processed in one second. This is worked out by multiplying the total number of 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

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