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GeForce 820M vs GeForce 9800 GT 1GB

Intro

The GeForce 820M features a GPU core clock speed of 719 MHz, and the 2048 MB of DDR3 RAM runs at 1000 MHz through a 64-bit bus. It also features 96 Stream Processors, 16 TAUs, and 4 ROPs.

Compare all that to the GeForce 9800 GT 1GB, which has GPU core speed of 600 MHz, and 1024 MB of GDDR3 memory set to run at 900 MHz through a 256-bit bus. It also is comprised of 112 Stream Processors, 56 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
GeForce 9800 GT 1GB 105 Watts
Difference: 90 Watts (600%)

Memory Bandwidth

The GeForce 9800 GT 1GB, in theory, should perform much faster than the GeForce 820M overall. (explain)

GeForce 9800 GT 1GB 57600 MB/sec
GeForce 820M 16000 MB/sec
Difference: 41600 (260%)

Texel Rate

The GeForce 9800 GT 1GB is quite a bit (about 192%) more effective at anisotropic filtering than the GeForce 820M. (explain)

GeForce 9800 GT 1GB 33600 Mtexels/sec
GeForce 820M 11504 Mtexels/sec
Difference: 22096 (192%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce 9800 GT 1GB is the winner, by far. (explain)

GeForce 9800 GT 1GB 9600 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 6724 (234%)

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

Check prices at:

GeForce 9800 GT 1GB

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 820M GeForce 9800 GT 1GB
Manufacturer nVidia nVidia
Year February 2014 July 2008
Code Name GF117 G92a/b
Memory 2048 MB 1024 MB
Core Speed 719 MHz 600 MHz
Memory Speed 2000 MHz 1800 MHz
Power (Max TDP) 15 watts 105 watts
Bandwidth 16000 MB/sec 57600 MB/sec
Texel Rate 11504 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 9600 Mpixels/sec
Unified Shaders 96 112
Texture Mapping Units 16 56
Render Output Units 4 16
Bus Type DDR3 GDDR3
Bus Width 64-bit 256-bit
Fab Process 28 nm 65/55 nm
Transistors (Unknown) million 754 million
Bus PCIe 2.0 x16 PCIe x16 2.0
DirectX Version DirectX 12 DirectX 10
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the 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 maximum amount of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth - the lower the memory 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 9800 GT 1GB

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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