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GeForce 8400 GS 512MB vs GeForce 9500 GT DDR2

Intro

The GeForce 8400 GS 512MB features core speeds of 650 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 memory. It features 16 SPUs along with 8 TAUs and 4 Rasterization Operator Units.

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

(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

Theoretically speaking, the GeForce 9500 GT DDR2 should be 150% faster than the GeForce 8400 GS 512MB overall, because of its higher data rate. (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 is much (about 69%) better 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

If running with a high screen resolution is important to you, then the GeForce 9500 GT DDR2 is the winner, by far. (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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at handling 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 the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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