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GeForce 820M vs GeForce 8800 GTX

Intro

The GeForce 820M makes use of a 28 nm design. nVidia has clocked the core speed at 719 MHz. The DDR3 RAM works at a frequency of 1000 MHz on this particular model. It features 96 SPUs as well as 16 Texture Address Units and 4 ROPs.

Compare that to the GeForce 8800 GTX, which has a GPU core clock speed of 575 MHz, and 768 MB of GDDR3 RAM set to run at 900 MHz through a 384-bit bus. It also is made up of 128 SPUs, 64 Texture Address Units, and 24 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
GeForce 8800 GTX 155 Watts
Difference: 140 Watts (933%)

Memory Bandwidth

The GeForce 8800 GTX should in theory be quite a bit faster than the GeForce 820M overall. (explain)

GeForce 8800 GTX 86400 MB/sec
GeForce 820M 16000 MB/sec
Difference: 70400 (440%)

Texel Rate

The GeForce 8800 GTX should be quite a bit (more or less 220%) better at AF than the GeForce 820M. (explain)

GeForce 8800 GTX 36800 Mtexels/sec
GeForce 820M 11504 Mtexels/sec
Difference: 25296 (220%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce 8800 GTX is the winner, and very much so. (explain)

GeForce 8800 GTX 13800 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 10924 (380%)

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 820M

Amazon.com

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GeForce 8800 GTX

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 820M GeForce 8800 GTX
Manufacturer nVidia nVidia
Year February 2014 Nov 2006
Code Name GF117 G80
Memory 2048 MB 768 MB
Core Speed 719 MHz 575 MHz
Memory Speed 2000 MHz 1800 MHz
Power (Max TDP) 15 watts 155 watts
Bandwidth 16000 MB/sec 86400 MB/sec
Texel Rate 11504 Mtexels/sec 36800 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 13800 Mpixels/sec
Unified Shaders 96 128
Texture Mapping Units 16 64
Render Output Units 4 24
Bus Type DDR3 GDDR3
Bus Width 64-bit 384-bit
Fab Process 28 nm 90 nm
Transistors (Unknown) million 681 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 12 DirectX 10
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce 820M

Amazon.com

Check prices at:

GeForce 8800 GTX

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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