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GeForce 9400 GT 256MB vs GeForce 9500 GT DDR2

Intro

The GeForce 9400 GT 256MB comes with a core clock frequency of 550 MHz and a GDDR2 memory frequency of 400 MHz. It also features a 128-bit bus, and makes use of a 65 nm design. It features 16 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Compare that to the GeForce 9500 GT DDR2, which comes with a clock frequency of 550 MHz and a DDR2 memory speed of 500 MHz. It also features a 128-bit bus, and makes use of a 65 nm design. It is comprised of 32 SPUs, 16 Texture Address Units, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

In theory, the GeForce 9500 GT DDR2 is 25% faster than the GeForce 9400 GT 256MB in general, due to its higher bandwidth. (explain)

GeForce 9500 GT DDR2 16000 MB/sec
GeForce 9400 GT 256MB 12800 MB/sec
Difference: 3200 (25%)

Texel Rate

The GeForce 9500 GT DDR2 will be much (approximately 100%) faster with regards to anisotropic filtering than the GeForce 9400 GT 256MB. (explain)

GeForce 9500 GT DDR2 8800 Mtexels/sec
GeForce 9400 GT 256MB 4400 Mtexels/sec
Difference: 4400 (100%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce 9500 GT DDR2 is a better choice, and very much so. (explain)

GeForce 9500 GT DDR2 4400 Mpixels/sec
GeForce 9400 GT 256MB 2200 Mpixels/sec
Difference: 2200 (100%)

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

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GeForce 9400 GT 256MB

Amazon.com

Check prices at:

GeForce 9500 GT DDR2

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 9500 GT DDR2
Manufacturer nVidia nVidia
Year August 2008 July 2008
Code Name G96a G96a
Memory 256 MB 256 MB
Core Speed 550 MHz 550 MHz
Memory Speed 800 MHz 1000 MHz
Power (Max TDP) 50 watts 50 watts
Bandwidth 12800 MB/sec 16000 MB/sec
Texel Rate 4400 Mtexels/sec 8800 Mtexels/sec
Pixel Rate 2200 Mpixels/sec 4400 Mpixels/sec
Unified Shaders 16 32
Texture Mapping Units 8 16
Render Output Units 4 8
Bus Type GDDR2 DDR2
Bus Width 128-bit 128-bit
Fab Process 65 nm 65 nm
Transistors 314 million 314 million
Bus PCIe x16 2.0, 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 maximum amount of data (counted in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the graphics 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 most pixels that the graphics card can 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 colour ROPs by the the card's clock speed. 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 is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce 9400 GT 256MB

Amazon.com

Check prices at:

GeForce 9500 GT DDR2

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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