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GeForce 8400 GS 512MB vs GeForce 9600 GT 1GB

Intro

The GeForce 8400 GS 512MB uses a 80 nm design. nVidia has clocked the core speed at 650 MHz. The DDR2 memory runs at a speed of 400 MHz on this specific card. It features 16 SPUs along with 8 TAUs and 4 ROPs.

Compare all that to the GeForce 9600 GT 1GB, which features core speeds of 650 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR3 memory. It features 64 SPUs as well as 32 TAUs 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

In theory, the GeForce 9600 GT 1GB is 800% faster than the GeForce 8400 GS 512MB overall, due to its greater data rate. (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 much (approximately 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

The GeForce 9600 GT 1GB is much (approximately 300%) better at full screen anti-aliasing than the GeForce 8400 GS 512MB, and will be capable of handling higher resolutions without slowing down too much. (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: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 are processed in one second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the 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 clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

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