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GeForce 820M vs GeForce 8600 GT 1GB DDR2

Intro

The GeForce 820M features a core clock speed of 719 MHz and a DDR3 memory frequency of 1000 MHz. It also features a 64-bit memory bus, and makes use of a 28 nm design. It is comprised of 96 SPUs, 16 Texture Address Units, and 4 Raster Operation Units.

Compare those specs to the GeForce 8600 GT 1GB DDR2, which uses a 80 nm design. nVidia has clocked the core speed at 540 MHz. The DDR2 memory works at a frequency of 400 MHz on this specific model. It features 32 SPUs as well as 16 Texture Address Units and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
GeForce 8600 GT 1GB DDR2 47 Watts
Difference: 32 Watts (213%)

Memory Bandwidth

In theory, the GeForce 820M is 25% quicker than the GeForce 8600 GT 1GB DDR2 in general, because of its higher data rate. (explain)

GeForce 820M 16000 MB/sec
GeForce 8600 GT 1GB DDR2 12800 MB/sec
Difference: 3200 (25%)

Texel Rate

The GeForce 820M should be a lot (more or less 33%) more effective at anisotropic filtering than the GeForce 8600 GT 1GB DDR2. (explain)

GeForce 820M 11504 Mtexels/sec
GeForce 8600 GT 1GB DDR2 8640 Mtexels/sec
Difference: 2864 (33%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce 8600 GT 1GB DDR2 is the winner, by far. (explain)

GeForce 8600 GT 1GB DDR2 4320 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 1444 (50%)

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 8600 GT 1GB DDR2

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 8600 GT 1GB DDR2
Manufacturer nVidia nVidia
Year February 2014 April 2007
Code Name GF117 G84
Memory 2048 MB 1024 MB
Core Speed 719 MHz 540 MHz
Memory Speed 2000 MHz 800 MHz
Power (Max TDP) 15 watts 47 watts
Bandwidth 16000 MB/sec 12800 MB/sec
Texel Rate 11504 Mtexels/sec 8640 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 4320 Mpixels/sec
Unified Shaders 96 32
Texture Mapping Units 16 16
Render Output Units 4 8
Bus Type DDR3 DDR2
Bus Width 64-bit 128-bit
Fab Process 28 nm 80 nm
Transistors (Unknown) million 289 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 moved across the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, 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 texture units of the card by the core clock speed of the chip. The higher the texel rate, 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 that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

GeForce 820M

Amazon.com

Check prices at:

GeForce 8600 GT 1GB DDR2

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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