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GeForce 8400 GS 512MB vs GeForce 9500 GT DDR2

Intro

The GeForce 8400 GS 512MB makes use of a 80 nm design. nVidia has set the core frequency at 650 MHz. The DDR2 memory runs at a speed of 400 MHz on this specific card. It features 16 SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.

Compare that to the GeForce 9500 GT DDR2, which features a clock speed of 550 MHz and a DDR2 memory frequency of 500 MHz. It also uses a 128-bit memory bus, and uses a 65 nm design. It is comprised of 32 SPUs, 16 Texture Address Units, and 8 ROPs.

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

The GeForce 9500 GT DDR2 should in theory be much 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 will be quite a bit (about 69%) more effective at 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

The GeForce 9500 GT DDR2 should be quite a bit (approximately 69%) better at AA than the GeForce 8400 GS 512MB, and should be capable of handling higher screen resolutions while still performing well. (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

GeForce 8400 GS 512MB

GeForce 9500 GT DDR2

Specifications

Display 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 max 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 card's interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

GeForce 8400 GS 512MB

GeForce 9500 GT DDR2

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