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GeForce 9400 GT 256MB vs GeForce 9500 GT DDR2

Intro

The GeForce 9400 GT 256MB comes with a GPU clock speed of 550 MHz, and the 256 MB of GDDR2 RAM is set to run at 400 MHz through a 128-bit bus. It also is made up of 16 SPUs, 8 TAUs, and 4 ROPs.

Compare that to the GeForce 9500 GT DDR2, which has GPU clock speed of 550 MHz, and 256 MB of DDR2 RAM running at 500 MHz through a 128-bit bus. It also is made up of 32 Stream Processors, 16 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the GeForce 9500 GT DDR2 is 25% faster than the GeForce 9400 GT 256MB overall, due to its greater data rate. (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 (more or less 100%) better at 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

The GeForce 9500 GT DDR2 will be a lot (about 100%) faster with regards to full screen anti-aliasing than the GeForce 9400 GT 256MB, and capable of handling higher screen resolutions without slowing down too much. (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

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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 max amount of information (in units of megabytes per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once 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 number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total amount of texture units by the core clock 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 that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach 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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