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GeForce 820M vs GeForce 8600 GT 1GB DDR2

Intro

The GeForce 820M uses a 28 nm design. nVidia has clocked the core frequency at 719 MHz. The DDR3 RAM is set to run at a speed of 1000 MHz on this specific card. It features 96 SPUs as well as 16 TAUs and 4 Rasterization Operator Units.

Compare that to the GeForce 8600 GT 1GB DDR2, which has GPU clock speed of 540 MHz, and 1024 MB of DDR2 memory running at 400 MHz through a 128-bit bus. It also features 32 SPUs, 16 TAUs, and 8 Raster Operation 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 overall, 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 is a lot (about 33%) better at AF 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

The GeForce 8600 GT 1GB DDR2 is a lot (about 50%) more effective at AA than the GeForce 820M, and will be capable of handling higher screen resolutions better. (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

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GeForce 8600 GT 1GB DDR2

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 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 information (measured in MB per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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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.

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