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GeForce 9400 GT 256MB vs GeForce 9800 GX2

Intro

The GeForce 9400 GT 256MB features a GPU core clock speed of 550 MHz, and the 256 MB of GDDR2 RAM runs at 400 MHz through a 128-bit bus. It also is made up of 16 Stream Processors, 8 TAUs, and 4 ROPs.

Compare those specifications to the GeForce 9800 GX2, which comes with GPU core speed of 600 MHz, and 512 MB of GDDR3 RAM running at 1000 MHz through a 256-bit bus. It also is comprised of 128 SPUs, 64 Texture Address Units, and 16 Raster Operation 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

Theoretically speaking, the GeForce 9800 GX2 will be 900% quicker than the GeForce 9400 GT 256MB overall, due to its higher bandwidth. (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 a lot (more or less 1645%) faster with regards to AF 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

If using a high screen resolution is important to you, then the GeForce 9800 GX2 is superior to the GeForce 9400 GT 256MB, by a large margin. (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: Bandwidth is the max amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 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 anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out 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 video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core 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 output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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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.

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