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GeForce 9400 GT 256MB vs GeForce 9800 GX2

Intro

The GeForce 9400 GT 256MB makes use of a 65 nm design. nVidia has set the core frequency at 550 MHz. The GDDR2 memory runs at a frequency of 400 MHz on this card. It features 16 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Compare those specifications to the GeForce 9800 GX2, which features core speeds of 600 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR3 memory. It features 128 SPUs as well as 64 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB 50 Watts
GeForce 9800 GX2 197 Watts
Difference: 147 Watts (294%)

Memory Bandwidth

In theory, the GeForce 9800 GX2 should perform a lot faster than the GeForce 9400 GT 256MB overall. (explain)

GeForce 9800 GX2 128000 MB/sec
GeForce 9400 GT 256MB 12800 MB/sec
Difference: 115200 (900%)

Texel Rate

The GeForce 9800 GX2 will be much (more or less 1645%) better at anisotropic filtering than the GeForce 9400 GT 256MB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
GeForce 9400 GT 256MB 4400 Mtexels/sec
Difference: 72400 (1645%)

Pixel Rate

The GeForce 9800 GX2 should be quite a bit (more or less 773%) better at AA than the GeForce 9400 GT 256MB, and also will be able to handle higher resolutions without slowing down too much. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
GeForce 9400 GT 256MB 2200 Mpixels/sec
Difference: 17000 (773%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce 9400 GT 256MB

Amazon.com

Check prices at:

GeForce 9800 GX2

Amazon.com

Check prices at:

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 9400 GT 256MB GeForce 9800 GX2
Manufacturer nVidia nVidia
Year August 2008 Mar 2008
Code Name G96a G92
Memory 256 MB 512 MB (x2)
Core Speed 550 MHz 600 MHz (x2)
Memory Speed 800 MHz 2000 MHz (x2)
Power (Max TDP) 50 watts 197 watts
Bandwidth 12800 MB/sec 128000 MB/sec
Texel Rate 4400 Mtexels/sec 76800 Mtexels/sec
Pixel Rate 2200 Mpixels/sec 19200 Mpixels/sec
Unified Shaders 16 128 (x2)
Texture Mapping Units 8 64 (x2)
Render Output Units 4 16 (x2)
Bus Type GDDR2 GDDR3
Bus Width 128-bit 256-bit (x2)
Fab Process 65 nm 65 nm
Transistors 314 million 754 million
Bus PCIe x16 2.0, 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 (measured in MB per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, 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 worked out by multiplying the total texture units of the card by the core 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core speed of the card. 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 also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

GeForce 9400 GT 256MB

Amazon.com

Check prices at:

GeForce 9800 GX2

Amazon.com

Check prices at:

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.

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