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

Intro

The GeForce 8800 GTS (G80) 640MB comes with core speeds of 513 MHz on the GPU, and 792 MHz on the 640 MB of GDDR3 RAM. It features 96 SPUs along with 48 Texture Address Units and 20 Rasterization Operator Units.

Compare all that to the GeForce GT 420, which has a GPU core clock speed of 700 MHz, and 2048 MB of GDDR3 memory running at 900 MHz through a 128-bit bus. It also is comprised of 48 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

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 perform a lot 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 (about 340%) better at texture filtering 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 is much (approximately 266%) better at anti-aliasing than the GeForce GT 420, and should be able to handle higher screen resolutions without slowing down too much. (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

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 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: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units of the card by the core 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out 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 fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

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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