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GeForce 8400 GS 512MB vs GeForce GT 420

Intro

The GeForce 8400 GS 512MB has a GPU clock speed of 650 MHz, and the 512 MB of DDR2 RAM runs at 400 MHz through a 64-bit bus. It also features 16 SPUs, 8 TAUs, and 4 ROPs.

Compare all that to the GeForce GT 420, which features GPU clock speed of 700 MHz, and 2048 MB of GDDR3 memory set to run at 900 MHz through a 128-bit bus. It also is made up of 48 SPUs, 8 TAUs, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB 40 Watts
GeForce GT 420 50 Watts
Difference: 10 Watts (25%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 420 is 350% faster than the GeForce 8400 GS 512MB in general, due to its higher bandwidth. (explain)

GeForce GT 420 28800 MB/sec
GeForce 8400 GS 512MB 6400 MB/sec
Difference: 22400 (350%)

Texel Rate

The GeForce GT 420 will be a little bit (more or less 8%) more effective at AF than the GeForce 8400 GS 512MB. (explain)

GeForce GT 420 5600 Mtexels/sec
GeForce 8400 GS 512MB 5200 Mtexels/sec
Difference: 400 (8%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GT 420 is superior to the GeForce 8400 GS 512MB, but not by far. (explain)

GeForce GT 420 2800 Mpixels/sec
GeForce 8400 GS 512MB 2600 Mpixels/sec
Difference: 200 (8%)

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 8400 GS 512MB

Amazon.com

Check prices at:

GeForce GT 420

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 8400 GS 512MB GeForce GT 420
Manufacturer nVidia nVidia
Year June 2007 September 2010
Code Name G86 GF108
Memory 512 MB 2048 MB
Core Speed 650 MHz 700 MHz
Memory Speed 800 MHz 1800 MHz
Power (Max TDP) 40 watts 50 watts
Bandwidth 6400 MB/sec 28800 MB/sec
Texel Rate 5200 Mtexels/sec 5600 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 2800 Mpixels/sec
Unified Shaders 16 48
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type DDR2 GDDR3
Bus Width 64-bit 128-bit
Fab Process 80 nm 40 nm
Transistors 210 million 585 million
Bus PCIe x16, PCI PCIe x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 are processed in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs 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 rate also depends on lots of other factors, especially 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 8400 GS 512MB

Amazon.com

Check prices at:

GeForce GT 420

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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