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GeForce 8400 GS 512MB vs GeForce 9500 GT DDR2

Intro

The GeForce 8400 GS 512MB comes with a clock speed of 650 MHz and a DDR2 memory frequency of 400 MHz. It also features a 64-bit bus, and uses a 80 nm design. It is made up of 16 SPUs, 8 TAUs, and 4 Raster Operation Units.

Compare that to the GeForce 9500 GT DDR2, which comes with a GPU core clock speed of 550 MHz, and 256 MB of DDR2 memory running at 500 MHz through a 128-bit bus. It also is comprised of 32 SPUs, 16 TAUs, and 8 Raster Operation Units.

(No game benchmarks for this combination yet.)

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 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 should be a lot (about 69%) more effective at AF 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 (about 69%) faster with regards to full screen anti-aliasing than the GeForce 8400 GS 512MB, and also should be able to handle higher resolutions more effectively. (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

Amazon.com

GeForce 9500 GT DDR2

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 9500 GT DDR2
Manufacturer nVidia nVidia
Year June 2007 July 2008
Code Name G86 G96a
Fab Process 80 nm 65 nm
Bus PCIe x16, PCI PCIe x16 2.0, PCI
Memory 512 MB 256 MB
Core Speed 650 MHz 550 MHz
Shader Speed 1100 MHz 1400 MHz
Memory Speed 400 MHz (800 MHz effective) 500 MHz (1000 MHz effective)
Unified Shaders 16 32
Texture Mapping Units 8 16
Render Output Units 4 8
Bus Type DDR2 DDR2
Bus Width 64-bit 128-bit
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0
Power (Max TDP) 40 watts 50 watts
Shader Model 4.0 4.0
Bandwidth 6400 MB/sec 16000 MB/sec
Texel Rate 5200 Mtexels/sec 8800 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 4400 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (in units of MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units of the card by the core 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

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