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GeForce 8400 GS 512MB vs GeForce 9500 GT DDR2


Intro

The GeForce 8400 GS 512MB has a clock speed of 650 MHz and a DDR2 memory frequency of 400 MHz. It also makes use of a 64-bit memory bus, and makes use of a 80 nm design. It features 16 SPUs, 8 Texture Address Units, and 4 ROPs.

Compare all of that to the GeForce 9500 GT DDR2, which has a clock frequency of 550 MHz and a DDR2 memory speed of 500 MHz. It also features a 128-bit memory bus, and uses a 65 nm design. It is made up of 32 SPUs, 16 TAUs, and 8 Raster Operation Units.

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 theoretically perform quite a bit 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 (approximately 69%) more effective at texture 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 much (more or less 69%) more effective at AA than the GeForce 8400 GS 512MB, and also should be able to handle higher screen resolutions without losing too much performance. (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 largest amount of information (in units of MB per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

GeForce 8400 GS 512MB

GeForce 9500 GT DDR2

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