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GeForce 9400 GT 256MB vs GeForce GT 340 1GB

Intro

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

Compare that to the GeForce GT 340 1GB, which comes with a clock speed of 550 MHz and a GDDR5 memory speed of 850 MHz. It also makes use of a 128-bit bus, and makes use of a 40 nm design. It is comprised of 96 SPUs, 32 Texture Address Units, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB 50 Watts
GeForce GT 340 1GB 69 Watts
Difference: 19 Watts (38%)

Memory Bandwidth

Theoretically, the GeForce GT 340 1GB should perform a lot faster than the GeForce 9400 GT 256MB overall. (explain)

GeForce GT 340 1GB 54400 MB/sec
GeForce 9400 GT 256MB 12800 MB/sec
Difference: 41600 (325%)

Texel Rate

The GeForce GT 340 1GB will be quite a bit (approximately 300%) faster with regards to AF than the GeForce 9400 GT 256MB. (explain)

GeForce GT 340 1GB 17600 Mtexels/sec
GeForce 9400 GT 256MB 4400 Mtexels/sec
Difference: 13200 (300%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GT 340 1GB is a better choice, and very much so. (explain)

GeForce GT 340 1GB 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 GT 340 1GB

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 GT 340 1GB
Manufacturer nVidia nVidia
Year August 2008 February 2010
Code Name G96a GT215
Memory 256 MB 1024 MB
Core Speed 550 MHz 550 MHz
Memory Speed 800 MHz 3400 MHz
Power (Max TDP) 50 watts 69 watts
Bandwidth 12800 MB/sec 54400 MB/sec
Texel Rate 4400 Mtexels/sec 17600 Mtexels/sec
Pixel Rate 2200 Mpixels/sec 4400 Mpixels/sec
Unified Shaders 16 96
Texture Mapping Units 8 32
Render Output Units 4 8
Bus Type GDDR2 GDDR5
Bus Width 128-bit 128-bit
Fab Process 65 nm 40 nm
Transistors 314 million 727 million
Bus PCIe x16 2.0, PCI PCIe x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.3

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units 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 rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

GeForce 9400 GT 256MB

Amazon.com

Check prices at:

GeForce GT 340 1GB

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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