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GeForce 8800 GTS (G80) 640MB vs GeForce GT 420

Intro

The GeForce 8800 GTS (G80) 640MB comes with a GPU core clock speed of 513 MHz, and the 640 MB of GDDR3 RAM is set to run at 792 MHz through a 320-bit bus. It also features 96 SPUs, 48 TAUs, and 20 ROPs.

Compare all that to the GeForce GT 420, which comes with GPU core speed of 700 MHz, and 2048 MB of GDDR3 memory running at 900 MHz through a 128-bit bus. It also features 48 SPUs, 8 TAUs, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
GeForce 8800 GTS (G80) 640MB 143 Watts
Difference: 93 Watts (186%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 GTS (G80) 640MB should be much faster than the GeForce GT 420 in general. (explain)

GeForce 8800 GTS (G80) 640MB 63360 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 34560 (120%)

Texel Rate

The GeForce 8800 GTS (G80) 640MB is a lot (approximately 340%) better at AF than the GeForce GT 420. (explain)

GeForce 8800 GTS (G80) 640MB 24624 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 19024 (340%)

Pixel Rate

The GeForce 8800 GTS (G80) 640MB will be a lot (approximately 266%) faster with regards to full screen anti-aliasing than the GeForce GT 420, and also will be able to handle higher resolutions without losing too much performance. (explain)

GeForce 8800 GTS (G80) 640MB 10260 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 7460 (266%)

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 8800 GTS (G80) 640MB

Amazon.com

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GeForce GT 420

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 8800 GTS (G80) 640MB GeForce GT 420
Manufacturer nVidia nVidia
Year Nov 2006 (640) September 2010
Code Name G80 GF108
Memory 640 MB 2048 MB
Core Speed 513 MHz 700 MHz
Memory Speed 1584 MHz 1800 MHz
Power (Max TDP) 143 watts 50 watts
Bandwidth 63360 MB/sec 28800 MB/sec
Texel Rate 24624 Mtexels/sec 5600 Mtexels/sec
Pixel Rate 10260 Mpixels/sec 2800 Mpixels/sec
Unified Shaders 96 48
Texture Mapping Units 48 8
Render Output Units 20 4
Bus Type GDDR3 GDDR3
Bus Width 320-bit 128-bit
Fab Process 90 nm 40 nm
Transistors 681 million 585 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. 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 texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

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

Display Prices

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GeForce 8800 GTS (G80) 640MB

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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