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GeForce 8400 GS 512MB vs GeForce GT 420

Intro

The GeForce 8400 GS 512MB features clock speeds of 650 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 memory. It features 16 SPUs along with 8 TAUs and 4 Rasterization Operator Units.

Compare all that to the GeForce GT 420, which features core speeds of 700 MHz on the GPU, and 900 MHz on the 2048 MB of GDDR3 RAM. It features 48 SPUs along with 8 TAUs and 4 Rasterization Operator Units.

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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

Performance-wise, the GeForce GT 420 should theoretically be a lot better than the GeForce 8400 GS 512MB overall. (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 small bit (more or less 8%) better 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 using a high resolution is important to you, then the GeForce GT 420 is the winner, but it probably won't make a huge difference. (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: Bandwidth is the maximum amount of data (in units of MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, 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 processed in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the 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 the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount 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 drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

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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