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GeForce 9400 GT 256MB vs GeForce 9500 GT DDR2

Intro

The GeForce 9400 GT 256MB has clock speeds of 550 MHz on the GPU, and 400 MHz on the 256 MB of GDDR2 RAM. It features 16 SPUs as well as 8 Texture Address Units and 4 Rasterization Operator Units.

Compare those specs to the GeForce 9500 GT DDR2, which comes with clock speeds of 550 MHz on the GPU, and 500 MHz on the 256 MB of DDR2 RAM. It features 32 SPUs along with 16 TAUs and 8 Rasterization Operator Units.

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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 in general, because of 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 should be a lot (approximately 100%) faster with regards to AF 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 high levels of AA is important to you, then the GeForce 9500 GT DDR2 is superior to the GeForce 9400 GT 256MB, by far. (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: Bandwidth is the max amount of information (in units of megabytes per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's 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 amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units 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 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 worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many 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 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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