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GeForce 9400 GT 256MB vs GeForce GTX 660

Intro

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

Compare those specifications to the GeForce GTX 660, which has core clock speeds of 980 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 RAM. It features 960 SPUs along with 80 TAUs and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB 50 Watts
GeForce GTX 660 140 Watts
Difference: 90 Watts (180%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 should be 1027% faster than the GeForce 9400 GT 256MB overall, due to its greater data rate. (explain)

GeForce GTX 660 144192 MB/sec
GeForce 9400 GT 256MB 12800 MB/sec
Difference: 131392 (1027%)

Texel Rate

The GeForce GTX 660 is quite a bit (approximately 1682%) better at AF than the GeForce 9400 GT 256MB. (explain)

GeForce GTX 660 78400 Mtexels/sec
GeForce 9400 GT 256MB 4400 Mtexels/sec
Difference: 74000 (1682%)

Pixel Rate

The GeForce GTX 660 should be much (more or less 969%) faster with regards to full screen anti-aliasing than the GeForce 9400 GT 256MB, and also should be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 660 23520 Mpixels/sec
GeForce 9400 GT 256MB 2200 Mpixels/sec
Difference: 21320 (969%)

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

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GeForce GTX 660

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 GTX 660
Manufacturer nVidia nVidia
Year August 2008 September 2012
Code Name G96a GK106
Memory 256 MB 2048 MB
Core Speed 550 MHz 980 MHz
Memory Speed 800 MHz 6008 MHz
Power (Max TDP) 50 watts 140 watts
Bandwidth 12800 MB/sec 144192 MB/sec
Texel Rate 4400 Mtexels/sec 78400 Mtexels/sec
Pixel Rate 2200 Mpixels/sec 23520 Mpixels/sec
Unified Shaders 16 960
Texture Mapping Units 8 80
Render Output Units 4 24
Bus Type GDDR2 GDDR5
Bus Width 128-bit 192-bit
Fab Process 65 nm 28 nm
Transistors 314 million 2540 million
Bus PCIe x16 2.0, PCI PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.0
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce 9400 GT 256MB

Amazon.com

Check prices at:

GeForce GTX 660

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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